Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb9a7f4f7668cb5…

MALICIOUS

PDF

77.0 KB Created: 2021-04-23 11:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fda74f55cc0c203ef3a8b2f6804f62db SHA-1: 51f5aa581cabdf727106b3f4aa30e80bb06918c3 SHA-256: 2eb9a7f4f7668cb5bbe6253fa16285f767de47ff50fa09b0e69905d17601e7f5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, a common tactic for SEO manipulation or distributing malicious content. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The embedded URLs likely serve as the primary mechanism for redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=what+are+the+principles+of+successful+innovation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393632/normal_6037afc23bf68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375696/normal_5fef38e75539a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_604ae24d61c72.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/dometic_b59516.xx1j0_manual.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/a9c8a821-2221-4c97-8a43-266cbf714876/how_to_connect_qcy_t1.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/user_stories_examples_with_acceptance_criteria.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/modobobafimesadasu.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_ce8011bde7704f76bbc2a2aad0452a5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/3342394475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bce444d-cf24-434f-9d85-0ceb6f84b2e4/ipod_touch_5th_generation_price_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48cf3d4a-5e2c-4041-a377-9a7efc72e033/wuteworejus.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_8e723ff1278149c0b843be222dde6696.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8834aba2-6a79-4dc2-9020-a44b01ea60e4/how_to_draw_anime_hair_beginners.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_30605cb06e93444c97633e933ee276c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d378f0ac-0b02-4934-bc8f-68ae579eb26a/2007_victory_vegas_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c198ee27-6052-4329-a55f-a62eb53628dd/kazutedarig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c64e00-40f7-4417-810e-331d4de725eb/jopamoleliratofato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da5964c-9233-4117-ad00-67bdebab45ed/supply_chain_management_salary_in_south_africa.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_15983abac3a24e3e88406f188cc4be5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/matuvunirilokopirodoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/bexonuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1baae783-ec8c-4a24-89e4-ba214f11f6ed/23717538495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f02f150-95cb-4525-a419-2aa06d9928d7/how_old_to_get_a_drivers_license_in_maryland.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/esc_guidelines_for_hypertension_2018.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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 5176 bytes
SHA-256: aa2656c19a8620e1e6539e76a5b44b2ed85d84dffe4100a53941cee32d33726e
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10768 bytes
SHA-256: a45c063333f53c4ff16d839778d11f2464e94e6be3127cbfc121851c446a1d0a