Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e5d3bd733275ed…

MALICIOUS

PDF

88.1 KB Created: 2021-01-05 21:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d2d5fdfa1ac52ca15754e34dbbda94ac SHA-1: d10c45f896d68c339c0659a3642f759fa75d62a3 SHA-256: 13e5d3bd733275edce7b5e378b0fb03b00f2e06004d8d385adc02e353144954e
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of urgency language in the document body further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffset.ru/aws?utm_term=cuyahoga+county+board+of+elections+finance+reports PDF link annotation
    • https://fajubixinusejeg.weebly.com/uploads/1/3/4/8/134850070/gumetosufoj_gilafaju_pamoxaxom_rajewulo.pdfIn PDF document text
    • https://pezitojuxesuvog.weebly.com/uploads/1/3/4/6/134608136/towozuvikemezad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5fa1029082c47.pdfIn PDF document text
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/4582073.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/1XsfeGm/fast_racing_neo_wii_u.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/jazulifevalosu.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/goneduzum/32210189596.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/sidemopebopoxuj.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/botox_for_piriformis_muscle.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/ambareesha_kannada_movie_audio_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/high_alch_guide_rs3.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_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 5564 bytes
SHA-256: 29816f75829255a6ad5a19378919ab48850cddfa0d6c7055e42a879dfe2dcdce
font_01_sfnt_off00012cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 11600 bytes
SHA-256: 73ca4bc20af2cee5350deac191b91c2ea010a00076e071998dfb13f2bab520a7

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