Malicious PDF — malware analysis report

Static analysis result for SHA-256 350066df2376b927…

MALICIOUS

PDF

76.2 KB Created: 2021-03-01 23:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 89118cbc8917e05e9fdd9df950087bc5 SHA-1: d4dd20ef36282e148263aa3b009442bdff68cde2 SHA-256: 350066df2376b927864e65782e32d90a334ae60d339b3f65031aceb9cf5594f2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a search result snippet, further supporting the lure-based attack pattern. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=is+fujitsu+fi-6130z+compatible+with+windows+10 PDF link annotation
    • http://wellwork.site/xisuxipimibusek0epdv.pdfIn PDF document text
    • http://herss.space/ping_pong_masters_mod457re.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_60254ee56da75.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/jugokavelow.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/2756401857.pdfIn PDF document text
    • https://posofipijetudu.weebly.com/uploads/1/3/1/3/131380531/kexebiladam-gedoganon-katilidawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fe38f9949fbb.pdfIn PDF document text
    • http://checkyourcredit.info/asterix_y_obelix_personajes_romanoszdrqo.pdfIn PDF document text
    • http://peuer.xyz/jubewimoligagituravejn117.pdfIn PDF document text
    • https://jexetapi.weebly.com/uploads/1/3/4/3/134345775/1b8bf02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417830/normal_5fe1a040c3d5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_603438bf79dc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/niporofez/facebook_chat_java_app.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/64889204825.pdfIn PDF document text
    • http://wovotunuvovon.epizy.com/vuwogagoburero.pdfIn PDF document text
    • http://fipaliwabalutu.rf.gd/android_emulator_for_pc_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/napenetawesadalu.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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 6140 bytes
SHA-256: 26b280bebfb57e665ff852171dcd663faf591f91caf7ca8a053899bf309997c7
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 13148 bytes
SHA-256: 887e8173fea0c290a24db72b6c3d1396037e28e9432f70df675e08087dd96e75

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