Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c74099f762bfd9…

MALICIOUS

PDF

72.2 KB Created: 2021-04-05 19:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9c018536bb045fca0d19003b6d3dd7b4 SHA-1: 985ad79fab5bc43fd23e9d04767d758956bf4b63 SHA-256: d7c74099f762bfd97ac920025b5e1c09e6649bd09454ce336a418eb1bde11be8
126 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. One URL, https://midufefew.ru/strik?utm_term=lanco+greatest+love+story+guitar+chords, is directly embedded and has an unknown reputation, suggesting it could be a malicious redirect. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://midufefew.ru/strik?utm_term=lanco+greatest+love+story+guitar+chords PDF link annotation
    • http://kanshoper.site/3d_analyzer_software_for_pc_freevklrt.pdfIn PDF document text
    • https://zovitixakozi.weebly.com/uploads/1/3/1/4/131483416/fenotovavanogafafude.pdfIn PDF document text
    • http://mylic.ru/wahl_bravura_cordless_dog_clipperswmdcc.pdfIn PDF document text
    • http://svoytrylend.xyz/beyondtrust_password_safe_datasheetckwla.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/kafikoluwegeno-tozuxuw-pikiwor.pdfIn PDF document text
    • http://trylait.pro/d-link_dir-825_wireless_ac1200_dual_band_gigabit_routerapgkj.pdfIn PDF document text
    • http://agent-spv.space/estadistica_matematica_con_aplicaciones_freundw73ay.pdfIn PDF document text
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/vobovo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_89ee89090f0640a1aa9c91a1aeaef442.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/707d1556-f3df-472a-a03a-9deacdfc4e2d/examples_of_historically_marginalized_groups.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8341cff9-7550-4ab2-a138-7eb46c34ab61/5th_edition_monster_download_free.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_c40e8ba6ae524fee9198b19ac11fad06.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_e619b9c1ccbb41499588ae1d558b7507.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/808725bc-4b59-453f-b540-c33d210e7544/pl_sql_developer_jobs_in_canada.pdfIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_39beac1dc5b143bbb680a41b9e3140cb.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_60386d6904a64e7a9bf00271b0072789.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_03ec3074be8a4cb0a37034597bb297ef.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_a7ca479906b147699955d73963dd5bbe.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_75fe2be8820946ce9ed985b3d1f327f8.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_9eb1ff83d42a48418dc2622543d4b869.pdf?index=trueIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_26d4884af3f54cd8af85feca4094ace3.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_c63c9d06fcb347de81185a9c6c6479e9.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_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 5304 bytes
SHA-256: c84287c07d877ab5c34c9fa9a8e0496422e3adc4752182de74d9b0d56f308544
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10888 bytes
SHA-256: 2f761eb233dc253365218467b9172454311b173e5c94b29d2c5ef1c0ae4660be