Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6a3ccdff439a70…

MALICIOUS

PDF

74.7 KB Created: 2021-03-06 21:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ddff0952d48c70aa2945546239f69245 SHA-1: 91752e840456f2aa44cf71ea273c376313d62376 SHA-256: ee6a3ccdff439a7035714fd0445e299f3f5b1446683374a1d30df458a79fdb45
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0) and an ML classifier indicating maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or conduct phishing. The document body, though heavily obfuscated, appears to be a lure related to 'worksheet answers'. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=5.7+properties+of+logarithms+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/neridisen/gQRpBkN/baraye_dil_e_dukhtar_audio.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/how_to_describe_prime_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/WHjdjdN/97374254129.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/r7jfUgi/fabifujomojewolomewix.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/qjbjbgu/60285607416.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/how_to_fit_caravan_decals.pdfIn PDF document text
    • https://cdn.sqhk.co/sonorizeluwi/dhhjcnH/best_tiny_house_builders_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5fdc13439fa38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_60267baf222c3.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/KPigKgg/17896735032.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/NhpSYig/off_road_truck_3d_model.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_9f385707569641f4a6f80eeabf10b134.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/villagers_and_heroes_tailoring_guide.pdfIn PDF document text
    • http://puvapulugo.onlinewebshop.net/vuzuzakufaxejimanuwuf.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/52989636250.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_a3cf56f9a47642d2b40531f71468f58e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/begijufadi/77145503431.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_ec23443aca404c1fba1379a07de6ad65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/gegakoxiteperufuzu.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_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 5612 bytes
SHA-256: 77a78bc234e118a098dabe29942c9bcce551d1e9f7bff7024789303472783a45
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10548 bytes
SHA-256: b2a1a5c3d7d46cb2bd0dae255594addd29ba5e77d4969f5753fd7c5c0a9f4930

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