Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d64991372fe635…

MALICIOUS

PDF

74.3 KB Created: 2021-06-08 06:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 29b0df7bc6247febec169c6f01ec1dd2 SHA-1: 330cea05bae92e4e32717e4b2f24c5196df78d8b SHA-256: c8d64991372fe635ea52188757ce3bd2160b16a2fd10d3d5353992cea6a0fd1d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

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://catamma.ru/pbw?utm_term=lazy+boy+recliner+parts+handle PDF link annotation
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/lifesat_fusuf_sogezofotek.pdfIn PDF document text
    • https://datezovog.weebly.com/uploads/1/3/0/7/130776229/bowaw_gesonepubif_kawiweku_fogiz.pdfIn PDF document text
    • https://lorotemorotur.weebly.com/uploads/1/3/4/6/134649447/199902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_60be525372025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_5fe770d1adbf2.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/5751721.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/2a8467b3165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5ff545413f83c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dokadeku.pbworks.com/w/file/fetch/144832119/folding_picnic_table_plans_free.pdfIn PDF document text
    • http://naxenuve.pbworks.com/f/bouncing_checks_law.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/65413323596.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/dihybrid_crosses_worksheet_answers_unit_3.pdfIn PDF document text
    • http://figinav.pbworks.com/f/88662437657.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/52140457050.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/google_drive_unlimited_storage_mod_apk.pdfIn PDF document text
    • http://sawebaz.pbworks.com/w/file/fetch/144760392/1075886938.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/f/how_to_make_payment_on_crowd1.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/f/80222291735.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/w/file/fetch/144529782/bhakti_gane_dj_mix_song.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/kiss_me_2011_full_movie_watch_online.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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 5392 bytes
SHA-256: 360c77726201440aeb58fbd4b2cdba445336b0a0566ba5ec9b8201f3d2f22f70
font_01_sfnt_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 10300 bytes
SHA-256: e4fa661b3bccd798ded5c2b85130cfca23a3e9b280bda68b783552d6c92fb28b

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