Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aaa0afb4d6bc6f…

MALICIOUS

PDF

73.3 KB Created: 2021-03-29 02:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8982524605d375305fa4fdc2aaf81e43 SHA-1: 4a4744cddbdbb7babc28303eebeca9a8a3ae6ba2 SHA-256: 28aaa0afb4d6bc6f0c0c9d94cc37494b108a3e019fb1c40a73a97d1cfd779364
206 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan signature. It functions as a link farm, containing numerous external URLs, many of which point to disposable hosting and appear to be part of an SEO manipulation scheme. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious or deceptive content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/wix?keyword=riverfest+2020+buffalo+ny PDF link annotation
    • https://muputobiga.weebly.com/uploads/1/3/5/3/135308906/tosagamutiseg.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/3490661.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/bahama_bucks_job_application.pdfIn PDF document text
    • http://uber-global.com/31857163518bweax.pdfIn PDF document text
    • http://varuzajuv.22web.org/samsung_allshare_for_pc.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/zexuvote.pdfIn PDF document text
    • https://fanejutasoja.weebly.com/uploads/1/3/5/3/135399707/8923040.pdfIn PDF document text
    • http://shlifovka-pol.website/how_many_hours_does_a_shift_supervisor_work_at_starbucksctrqp.pdfIn PDF document text
    • http://nolaxevoxuvelij.iblogger.org/nature_beautiful_wallpapers_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_d691fb8d8cec4c17ad702191c3c89b66.pdf?index=trueIn PDF document text
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_1d331741785040bb9088a53aa2b06f31.pdf?index=trueIn PDF document text
    • http://xizesewidepo.epizy.com/fezogalolu.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_ad2db5bbb6a74c578881c3741156ff67.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_cbf8159871564a72b2f03509e6de8788.pdf?index=trueIn PDF document text
    • http://jipumenovimol.rf.gd/cantorales_catolicos.pdfIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_26002102d09f4446a954fe033c809c46.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_055cfb0fc7694dc2899346ab636e82c4.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_5fbdb03e76ce467697d580f6971f5b32.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_fd4e5c2215b249b0959870a6ecefd524.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 5344 bytes
SHA-256: 5545d5568d53a230414748991f968ff80eb7cde2e08d11c03d5530c0ceba0918
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 11356 bytes
SHA-256: 3f49282c8effa3274c256bf372c0db0f48cf012926ce6a43f8edd21f8638fc8e