Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4feb737a63354f…

MALICIOUS

PDF

69.5 KB Created: 2021-03-25 07:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 412bdf02b38a0f2d2b3ce14135c233a3 SHA-1: 21bf6c0f21ce986c74434453b246c2b30b443b5c SHA-256: af4feb737a63354f59497091b051422c3403790a2b38240ccde7329829c154bf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://xajibur.ru/wix?keyword=batman+bike+16+inch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380674/normal_602acf978bf29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_602864ac7e5cf.pdfIn PDF document text
    • http://muparizuxufuxud.22web.org/majijodurefaxejofar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_5fe5b0e09ab48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_5fd62cc9a3c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fefab462e892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390069/normal_5fca04dd272fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380525/normal_5ff1514a55484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451363/normal_6052e804b8521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486751/normal_5fde819e3e4c6.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/wizitifowubux/93528054133.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/adobe_flash_player_8_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/indeks_pembangunan_manusia_2015.pdfIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_97f28db6997b4ac2afecad85233217c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedure/associativismo_sebrae.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/76_flix_tv_guide.pdfIn PDF document text
    • http://tizesabukabel.rf.gd/6787554450.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/tisiradepexuposaw.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_6efddfe026654f1f9ccb501b750baae7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godewumazek/31769639249.pdfIn PDF document text
    • http://motakajukig.epizy.com/17093955672.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/61666274856.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 5192 bytes
SHA-256: 0e2a1b79f89f5a521813c1c7c34577857778722a567e765b4fd78a19410da968
font_01_sfnt_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 10732 bytes
SHA-256: 3e1cc1193eb90d4fda14858508ed13d47fb859685f6f9b06c4f7628d11f71348

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