Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b9c5b5f4fae64c…

MALICIOUS

PDF

93.5 KB Created: 2021-03-14 13:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 19a944fffaa713538cdb29c0a9bead48 SHA-1: c8cfe298657706cff1a74edd3053eeef4b8cb908 SHA-256: c5b9c5b5f4fae64cf1abb0851451e17014f26cf930fd140be926f3ce135b16b0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of a suspicious link to 'loginwithfb.site' and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/wix?keyword=2020+open+enrollment+powerpoint PDF link annotation
    • https://cdn.sqhk.co/fesakesovoka/jc8jdNq/31484391439.pdfIn PDF document text
    • http://thelait.pro/70824474071qldo5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456996/normal_60130b1d1dc81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459788/normal_603bcae2e621f.pdfIn PDF document text
    • http://hisgohar.site/lexamarapi6gs8d.pdfIn PDF document text
    • http://loginwithfb.site/aadhar_card_by_biometric_devicepn4lh.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/Avgihjp/bolokenizuduladop.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/i0jhWji/74363302623.pdfIn PDF document text
    • http://sis-paypal.com/college_board_sat_9_answerst241d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_5fdc4a192ba90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451023/normal_5fe3da30f3e24.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/fv2LMC5/65075064200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f8a2e133-f815-4640-9ead-650f7d598ee3/10951373784.pdfIn PDF document text
    • https://dd3a609d-fcd9-461e-ae06-f7e9ec6f332d.filesusr.com/ugd/811c3f_472c8cfbfd284b0bbff6e913d895be33.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_260a2f0fb9174aa183773bdfbe8579aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2813fb75-c51f-4a2e-a37e-bc118f132301/91944767189.pdfIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_647ffea22da049818e1eab0a3b85b5f6.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_99fe857fdccc4c46ae094bf8fa24afb4.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_7cf376e3753249cc9a6c4ca70e2b36a0.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_19e440e19d3541669e7fe64244c6ea05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0087687-9448-468d-ad27-665853f677ab/72514555764.pdfIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_c6bd26f3d0a240c386b8d6f23aa33d2f.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_2adf3b585c224015a3403723c1b25ce2.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_3e377836eb99436f8a5298de7145b37c.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_3a192c035654441e9ee06b3a3997fd6a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 4636 bytes
SHA-256: 0a0c1a8f30de4270ea553432576624f701d59d8760e584ee4878e59bb84d6ca9
font_01_sfnt_off000134a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A5 11112 bytes
SHA-256: 91a32ce709d99b940952837b7b67048aff8840e6e361915adf4ce8da91016804
font_02_sfnt_off00015a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A52 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71