Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c133717523f6c2…

MALICIOUS

PDF

78.2 KB Created: 2021-03-12 13:02:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0f2d46cfe3c02648131a6580d5e6700b SHA-1: 9dbf1390ace6354d4d84ff4abc3d376e286260e4 SHA-256: 06c133717523f6c237776828101fdf35408f47d2210d9ee5b88f021413d16e2e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://nipisod.ru/123?utm_term=spectra+3+breast+pump+manual', suggest a phishing or malware distribution lure, disguised as a product manual.

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://nipisod.ru/123?utm_term=spectra+3+breast+pump+manual PDF link annotation
    • http://geekcods.com/38735516424o1s9p.pdfIn PDF document text
    • http://usmileofficial.site/43177643954x65zm.pdfIn PDF document text
    • http://power-guard.shop/aprender_espanhol_online_e_gratis7ae1x.pdfIn PDF document text
    • http://trelon.fun/55115794466rjrli.pdfIn PDF document text
    • http://rodsfish.club/5433367614485zdp.pdfIn PDF document text
    • http://abwaab.su/87948866612jgke1.pdfIn PDF document text
    • http://micrometer25bill.site/learn_to_draw_books_for_8_year_oldsuzdtb.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/da575093-a075-4df8-9447-644f5031f3f2/twitter_sports_illustrated_swimsuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce969dd-0731-4b6d-acdd-02ad8a98ac78/how_to_clean_prius_battery_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1fb83a-cd8b-40d6-816a-457d8816b59a/how_many_sessions_of_emdr_for_ptsd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/016dda51-5982-4c89-92cc-254354aff926/mipalibelaj.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_7c260383a6034347a0b03b738b470fc3.pdf?index=trueIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_3e85da1ac6eb4eb39ca2ebaf62dadbf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cda395-9674-4c67-a4fa-bb7afbf702ad/how_to_use_a_foodsaver_v2490.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/69192846060.pdfIn PDF document text
    • https://056e1334-2be1-4885-8dd0-7eb70083a441.filesusr.com/ugd/1fa6dd_85f2ae12d59f409aa9bba66b3a612258.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8eb471-bf55-4749-9c9d-8a065730e3c3/genie_7055_wont_open.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_dd35ecf5a6e146dab3473b18f23686b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f30eea-4865-4db0-aeb1-644d31a60ac2/m-audio_fast_track_usb.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_37ed3966d89c463bb524c06d00467f59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92a5630-75c2-4911-9603-a64a0d870f0f/1762_if4_scaling.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/how_to_replace_heating_element_in_maytag_bravos_xl_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65283bbc-268b-4cc7-af5d-3bdf1a4b43d2/oster_double_flip_waffle_maker_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 5484 bytes
SHA-256: d47ff4450eb3649e14f621b06aff367bad1a2ad87b4f4ba15f2c899a0a5a4af0
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 10564 bytes
SHA-256: c575247bb57f378395c6d4e5d89e23e5e74178435cd944efaf4f33e31d4a75e5

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