Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ef93fb8db2d035…

MALICIOUS

PDF

86.6 KB Created: 2021-03-15 16:57:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 933f32585aefa0c7ac17ae717de6833b SHA-1: b63083a6488f087257c762ec2807e232d1967c6c SHA-256: 21ef93fb8db2d0352748c5f5ee217dea5d78524ba405a0059686bc3e01cae919
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging spearphishing attachments as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/aws?utm_term=onkyo+tx+nr515
    • https://kibopomirisusi.weebly.com/uploads/1/3/2/7/132741064/pekulirubovud.pdf
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/bubawaroxelopa.pdf
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/9794451.pdf
    • https://kurixaxewa.weebly.com/uploads/1/3/1/3/131383664/voloxubuvaj-kopepitesezakob.pdf
    • https://cdn.sqhk.co/ketejeti/aJuchaw/piano_keyboard_layout_61_keys.pdf
    • https://tudevapibor.weebly.com/uploads/1/3/4/8/134884273/e090f4ac41bd.pdf
    • https://cdn.sqhk.co/kagurase/gjpsVjC/english_songs_for_kids_free_video_download.pdf
    • https://novomegaweg.weebly.com/uploads/1/3/4/7/134738931/xedolajezu-giragexijiteduf-guxew.pdf
    • https://cdn.sqhk.co/jezuleku/bjgjc0g/muguvefosoxareluwizos.pdf
    • https://mudabomem.weebly.com/uploads/1/3/0/9/130969182/0a0347c.pdf
    • https://moxizeza.weebly.com/uploads/1/3/3/9/133999163/7965580.pdf
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/81188562e44c63a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dukexajuj/53343413417.pdf
    • https://uploads.strikinglycdn.com/files/5f3143b6-abc7-46d0-8cf4-ac882aeb1439/dell_inspiron_6400_power_adapter.pdf
    • https://s3.amazonaws.com/bidurudilidujug/does_blackberry_z10_support_android_apps.pdf
    • https://s3.amazonaws.com/labitajaxatufib/44205711756.pdf
    • https://s3.amazonaws.com/panalipolifod/chapters_interactive_stories_unlimited_diamonds_apk.pdf
    • https://uploads.strikinglycdn.com/files/99505ca5-7d15-433b-a656-d03d62526652/visarodud.pdf
    • https://s3.amazonaws.com/xukirizugukugi/30410575783.pdf
    • https://s3.amazonaws.com/sinadi/dijesufememajuti.pdf
    • https://s3.amazonaws.com/dazifozixawus/75815892253.pdf
    • https://s3.amazonaws.com/zuponefi/raruniforebugubibolave.pdf
    • https://s3.amazonaws.com/tobaziw/theory_of_catastrophism.pdf
    • https://uploads.strikinglycdn.com/files/9f69c755-8709-46e8-9973-71ffa6256c6b/23062774576.pdf
    • https://uploads.strikinglycdn.com/files/4089c31b-bcea-461b-9bdb-a3332a8a5c42/dulomeduseluribep.pdf
    • https://s3.amazonaws.com/temujonuwu/locus_assessment_score_sheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011754.bin
a5ec4314800df155c78b962660b1a1b2b424c2559c6fcd0d487e74b197633bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 4696 bytes
font_01_sfnt_off00012776.bin
b8c9485048a8f6702a3f15fac8e970d76618a6e22f26f894b8fe291aa9965f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 11308 bytes

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