Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b05a0fe57d79527…

MALICIOUS

PDF

80.3 KB Created: 2021-03-15 03:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 033138d000aa8e811dec6ab754e9c1fa SHA-1: 5c863532abaabf2b7f6098158fa9ddeaee5bd9cb SHA-256: 0b05a0fe57d795272be725b6344b20e89503bdcda152496a36f11333bc1e1d48
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to 'pedigrees practice human genetic disorders worksheet answers', a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/wix?keyword=pedigrees+practice+human+genetic+disorders+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/fotutubujuf/jdLWjbM/3151328592.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/xihrieu/lirugaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448539/normal_6001ed5663add.pdfIn PDF document text
    • https://nezejigon.weebly.com/uploads/1/3/4/6/134611081/1181396.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/ijichfH/35524289272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ff0c46d393f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_6019addc0c304.pdfIn PDF document text
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/tiweme-bajupopemenagot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fd6616fbdda8.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/ef6bbc5e6.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/ijhfhfz/the_beginners_survival_guide_minecraft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_603c2742c5f56.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/pVih9ij/marketing_definition_business_services.pdfIn PDF document text
    • https://masevaru.weebly.com/uploads/1/3/5/3/135346062/kapozof_wedoziroz.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/1e5dbfd3-4cdc-4860-9d25-5148f152cc41/murray_lawn_mowers_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bffc2ebd-79a9-468f-8bf5-a3f73409210b/rorukirezekubevupoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdfb09d-952a-441f-aaaa-5a7cd1870cb1/68353847706.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_beee80636f754e65a5d4eee1dbff7f7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d906a509-99ad-4826-b882-2876467c15b2/can_a_contract_have_a_retroactive_effective_date.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_91218a16b1cb44eeb7a82e08a2c12419.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_6afd44d334854c55ab51e2cb68042d3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/811b40fe-f150-4f4e-98ed-61b09bb52938/integral_calculus_volume_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8fad0b-4681-4956-93b6-774def27233f/walmart_black_friday_tvs_55_inch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f078c7b-14e7-4932-a378-afca3d18d634/myers_briggs_personality_types_characteristics.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_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 5612 bytes
SHA-256: ba5b33d8cd8259f29bebfcefab926f801ae0de78124551a541743457af07e586
font_01_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 10460 bytes
SHA-256: fe5b445c4f3cb259ff05d825503f5e8e55b4161f305c9260789e1f0511e0f25d