Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc82ae8bcca22055…

MALICIOUS

PDF

97.0 KB Created: 2021-03-31 03:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fa802f246ddda53292642bebf31c257e SHA-1: eaf3a39a30b4ecda1a54c8818c6c56c41cab96ab SHA-256: bc82ae8bcca22055aa34c05e0bdd16d20caee6134988be23578df851d527be5b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/123?utm_term=printable+iq+test+with+answer+key PDF link annotation
    • http://wezenilokiwuv.iblogger.org/nigesata.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/Siamia8/free_bubbles_overlay_for_photoshop.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/hzXsiiR/waste_shredder_machine_price_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/komifugu/jhJgdhS/ballout_lyrics_squad.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/bptgEjf/87281783624.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/agfijBv/amazon_kindle_oasis_e_reader_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/hvZFgc7/56132250588.pdfIn PDF document text
    • https://siwelarip.weebly.com/uploads/1/3/4/6/134682307/c12c0692a125a3.pdfIn PDF document text
    • http://balonedud.iblogger.org/sage_pastel_accounting_training_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/MQqTheJ/83242624819.pdfIn PDF document text
    • https://teribizekejuxes.weebly.com/uploads/1/3/5/3/135391999/varukuruwulapu-gakeke-ginadona.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/Koie9ia/jigagabema.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/8pWyhas/dr_david_ede_charleston_wv.pdfIn PDF document text
    • https://jesefunif.weebly.com/uploads/1/3/5/3/135393529/6202151.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_2022eee14f9a40c5a18ebe011878baeb.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_249741e68cfb4b0786893afcd1fbdebc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/bimexegadulefuderagopokov.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_245f3f3231b947e79370095c170389d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/17867906361.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_f29f4a603c11409cbb3496d97ed34e3f.pdf?index=trueIn PDF document text
    • http://wajifinome.epizy.com/vunixejikigijako.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/the_last_leaf_class_9_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/un_mundo_feliz_aldous_huxley_frases.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_off00013d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8C 5300 bytes
SHA-256: 1e4b075779bfc4ee71c7fddac4f15f5ef307f4317b3c90fbd15d5b27950b4479
font_01_sfnt_off00014f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9D 11284 bytes
SHA-256: 43e7f56af09cb5c07c4b35ed76c51729b8585e0c1c78e4cf42e7e7d926b5edcc