Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a35ecabd9bcc1d…

MALICIOUS

PDF

72.6 KB Created: 2021-03-09 22:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 15f70bd402b00423081a5784c20d43d5 SHA-1: aaf2f0d34ffdb381f8e56e3138aadad58f4eeba5 SHA-256: 41a35ecabd9bcc1d6d85a4f128910f3726ff59195667eecbf4155795b52859ee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wix?keyword=america+the+story+of+us+episode+8+boom+worksheet+answers PDF link annotation
    • http://blu-ital.space/analogies_worksheet_6th_gradeeyn8n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413120/normal_60073d1120209.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/24ec5abcbed3c6.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/legipexadapif-nugisadivi-xuwisapakijud.pdfIn PDF document text
    • http://fb-ig-violation.com/little_brother_cory_doctorow_quotesc811b.pdfIn PDF document text
    • http://lavkavkusa.store/10891969118skh96.pdfIn PDF document text
    • http://arbitestpark.xyz/82727807739vr8e1.pdfIn PDF document text
    • http://mydenverneighborhoods.com/adding_and_subtracting_fractions_like_denominators6psmb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_603cb0076c29f.pdfIn PDF document text
    • http://stavki-na-sport.site/noxokegec2s.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/wuvejibika_nobojodele_nolezerifasu_kiwil.pdfIn PDF document text
    • http://instapodarok365.site/270574645781dzgc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_602ca8e35e33b.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/8050856.pdfIn PDF document text
    • http://gayerkan.com/xizopafixbrl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_6001debb7d3d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girakes.rf.gd/kusasasepokowafa.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/ranifonemironufowadosob.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/butovosunefiwomitubotiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/nbme_step_1_practice_exams.pdfIn PDF document text
    • http://wetavirevamo.epizy.com/horseman_challenge_9_guide.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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 5944 bytes
SHA-256: c9cc02aea9f04cb8bafc5bcb143d78075b9448f42b4f4f86c70efaf8fc8deb82
font_01_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 10976 bytes
SHA-256: 20276eade54871a3c41f5b114a6633273f920ee2096fea812200d96899b38408

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