Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc6f4f7a442239e…

MALICIOUS

PDF

97.3 KB Created: 2021-03-13 23:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d0c5fb314736df64417d985bc841d306 SHA-1: 2aba0fa11544f39479965b84d4d1ac8f2a728fb4 SHA-256: 8cc6f4f7a442239e9b4e5174998a8185563f09c69d41de96d2dec020bb0fcddb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=java+32+bit+win+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496146/normal_5fecf5794e619.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/how_to_open_a_pachinko_machine.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/34653964691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_6013158cedd02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_60443ecfba784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fe43f8dbd64e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_603c1fe0ec064.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/7588007.pdfIn PDF document text
    • http://luwimifamofuper.iblogger.org/pupuri.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/nogefutemadi_webun_papano_vozogenobi.pdfIn PDF document text
    • http://tuwatisu.22web.org/90881687006.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/97541083803.pdfIn PDF document text
    • http://luloxijemise.medianewsonline.com/56485630728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevofelajasuz.epizy.com/maths_geometry_puzzles_with_answers.pdfIn PDF document text
    • http://gaditerigasut.rf.gd/69999855125.pdfIn PDF document text
    • http://nemebikox.epizy.com/wagidenugajeluvon.pdfIn PDF document text
    • http://jemudizibumak.epizy.com/history_and_theory_of_architecture.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/list_of_linux_commands_with_examples.pdfIn PDF document text
    • http://zomusuxine.rf.gd/31568603715.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/fixinisidizifalijafazax.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013fb9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13FB9 31076 bytes
SHA-256: 977610e09221661d367b8d56715f6cbdb08abd88023036a3e8a1d890c7ba363a
font_00_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 5028 bytes
SHA-256: 7710fc81c7913952085e06026d16984c8572c76cf8f45c2cb4acba4fe26d32b1
font_01_sfnt_off00011cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 10140 bytes
SHA-256: 8b28bcfc614b5559b661225d6efce8deffe163430bf3923426c20a92c435fb39

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