Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aeea2c49faeaa74…

MALICIOUS

PDF

84.2 KB Created: 2021-03-01 03:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cb853344a726226e59d62921b9a7a09a SHA-1: cddc52501ef55e92c89f09785f949bbd8e96da09 SHA-256: 1aeea2c49faeaa746ce87d7a9876404e3250b987912dfec355340c7fa5e830e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs 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. The embedded URLs point to various domains, likely serving as lures or redirects to malicious content.

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://jottigo.ru/wix?keyword=immortals+handbook+bestiary+pdf PDF link annotation
    • http://gakagebir.mypressonline.com/anatomy_and_physiology_colouring_book_for_nurses.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375884/normal_6005e54fe0291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_60163664962f4.pdfIn PDF document text
    • http://ketorebagibof.22web.org/jidajogireranatuzovipal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5fca09c049bb2.pdfIn PDF document text
    • http://maletewidulebil.iblogger.org/dofuse.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/stihl_bg_86_spark_arrestor_screen.pdfIn PDF document text
    • http://xikupolabije.22web.org/nueva_ley_acoso_laboral_en_puerto_rico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fe8234215afe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://latowetutut.epizy.com/gafofap.pdfIn PDF document text
    • http://jasumubi.rf.gd/sol_arona_tenerife_formerly_tryp_tenerife_reviews.pdfIn PDF document text
    • http://tulakitukubipi.epizy.com/93103074338.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_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 5524 bytes
SHA-256: 6823f68442865145c9b5036458fe68fc7dcc5beda1a29f256e580d0510eb98ee
font_01_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 15432 bytes
SHA-256: 2493060f31f08514d277ea42cacf3b6015b223ef79c194c19ef6d199e75521a5

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