Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f90c8d3441325f…

MALICIOUS

PDF

95.2 KB Created: 2021-04-29 12:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1cdf467181576cd49b3439eed5f815f5 SHA-1: 2bef6a5c2952d1e13c788b9de693b6d317698afc SHA-256: e3f90c8d3441325fb97d14617bc11e665ce1f581cc1b8823fe5be1f0e787bfc2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or phishing. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/strik?utm_term=the+body+electric+lyrics PDF link annotation
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/buninifijuzeb-juzajitaxino-sotegibujeruke.pdfIn PDF document text
    • http://tebefomi.22web.org/91598011068.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/hcMAigW/rowokoboborenibiziv.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/iaFgeij/stock_trading_simulator_game.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/8J0nhaC/ronezotamikenosimoruj.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/bemevo.pdfIn PDF document text
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/4715524.pdfIn PDF document text
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/sugijutune_robidit_suguwusi_fexolegivega.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/8dd24041-c39b-4144-b7f1-daf3f32bbe33/fujiwosuxesox.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_9e57155b9e554657bc58091340e52536.pdf?index=trueIn PDF document text
    • http://duguzikazom.rf.gd/what_the_sinhala_meaning_of_criminal_law.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/wogejetelabumili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ef6011-dce5-4762-ac63-6f35c679361c/liftmaster_41a5021-1h-315_remote.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_12c39d3eac1e4dc6a498e47ebe36f2c8.pdf?index=trueIn PDF document text
    • http://mafonoxerinomif.epizy.com/91831586562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023c899d-60ae-4f28-b9de-fe99e743cf67/79837277542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bed928d-de89-4f24-b52e-69946c0152a3/how_do_i_reset_my_keurig_k35_compact.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4f9834-771f-4628-bb3a-bac9ae0b9acc/sandro_botticelli_chart_of_hell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62858891-a103-42db-b44c-efba25feda37/ray_bradbury_quotes_on_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef5d658-4447-4313-8e0e-2d5104cf5c6c/sirakotal.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000137e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x137E8 30016 bytes
SHA-256: 228d0d1ab8df5a3a09457b7b17ad42f78365025806b54128ef3a68a2e4fc73af
font_00_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 5008 bytes
SHA-256: b4428654b6cde40d4b11f2ae71f42bb2dc821efb803bb8f654b822b34659944a
font_01_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 9840 bytes
SHA-256: 927a319a564cb932468f14f519c31c3fc7093ebdba418fa2ac0277c2228e70ab