Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac1fab35cb325ec…

MALICIOUS

PDF

83.6 KB Created: 2021-03-21 23:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 399f192fceac78400c4fcb9e44327e39 SHA-1: 8098584f3e7169277c4bdc4aab8d98eb4b7e7934 SHA-256: 0ac1fab35cb325ec3e60b7c4b63702a8f30eda9a4090a5c75f250df3462329a6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://fokemale.ru/123?utm_term=capitulo+5a+un+desastre+en+nicaragua+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379355/normal_6036178830a8e.pdfIn PDF document text
    • http://silkhfig.bid/jiboziragubuvuj9k.pdfIn PDF document text
    • http://instacopyrightcenter.com/11572610627clnm5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_603e840489c27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_60485c8256f51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0bce94f-230b-44f6-8b60-32b24b18942d/76895794238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49511015-700a-434e-ab9a-2f5a5d199a05/poulan_pro_5020_chainsaw_spark_plug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abeb4b1-0050-4068-ad29-6ef3356b4f54/the_origin_and_nature_of_man.pdfIn PDF document text
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_7b8cd356aa9349b8be6a94385415b0b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce22b2d-b023-4b5a-8168-3bc1754d9ef4/nixijujosesaviwozisajugi.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_f788ab41b21f46bfb6ffa1fa0b4f19ca.pdf?index=trueIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_814b1f684108458bbc5900958d58c6cf.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_a494fdd1a70d4ac28e7d4dfa48bee76d.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_277f1ace2c7c4922883eadd1613c9859.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24b7f87-c323-4017-a4f4-5ff9b801a9bc/philips_norelco_5000_trimmer_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35a9df1-b121-40e5-b140-fd8e5b3f763a/what_does_pie_symbolize.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_4cb5d191e2e149dea7a67815e5e35111.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d421076-d21e-4cd7-9afe-c1ffaec0b5a6/99897918025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1775118e-0f06-46ac-9be5-8dddec77556b/24550374243.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 5360 bytes
SHA-256: ee531ed560bf6214c5f3162e2f54e737e7b1b2e096bf78fa6a639fbe42850788
font_01_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 12640 bytes
SHA-256: e296b02d33eeb366cbb16e6f87a9265a3ec03092ae29c9f29820f42d97466e07