Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cfc0a1c1df6fb3…

MALICIOUS

PDF

70.0 KB Created: 2020-11-12 16:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f2306c3e85e3654ff1e48070f1f6570 SHA-1: 96a4d64e39b231e6dd3d8810e0a68b774ec88e2c SHA-256: 89cfc0a1c1df6fb387a7964d6fd427e1083458d6ba0c17abf8a176017abb90ab
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to S3 buckets, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://traffset.ru/123?utm_term=spider+man+homecoming+stream+amazon', is presented in a context that mimics search results, likely to trick users into clicking. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=spider+man+homecoming+stream+amazon
    • https://dojukigefob.weebly.com/uploads/1/3/4/5/134577696/6189509.pdf
    • https://cdn-cms.f-static.net/uploads/4368237/normal_5f9c64d34c336.pdf
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5fa12f1a1d401.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tetazino/fezopigopazotor.pdf
    • https://s3.amazonaws.com/gomakobez/hematology_basic_principles_and_practice_5th_edition.pdf
    • https://s3.amazonaws.com/bededuxotulapil/ielts_recent_actual_test_with_answers_vol_4.pdf
    • https://s3.amazonaws.com/vebogotexaf/citationmachine.net_apa_format.pdf
    • https://s3.amazonaws.com/luramamelolem/xaxavesixilaxukut.pdf
    • https://s3.amazonaws.com/suxugipipolazog/84463083741.pdf
    • https://s3.amazonaws.com/sugosubexez/70080045695.pdf
    • https://s3.amazonaws.com/tamobalasu/86391198969.pdf
    • https://uploads.strikinglycdn.com/files/dac5af8c-4668-4a6b-b1db-453d69697dae/tuwomov.pdf
    • https://uploads.strikinglycdn.com/files/0a757708-a790-43cb-bbd3-6187640e764f/mefiliwobajajikexasazi.pdf
    • https://s3.amazonaws.com/mejifavo/betty_crocker_sugar_cookie_mix_directions.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_off0000d05a.bin
d45108b756ac3750b21b667bc1ed742064c440cf39a3b15e6843ff22b596dc25
pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 5608 bytes
font_01_sfnt_off0000e345.bin
0b3ea358d874999cb8643be4c909b8872fab98344478ccf5255e3cd41af17582
pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 11616 bytes