Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc537e36c5ace9d…

MALICIOUS

PDF

69.7 KB Created: 2020-11-12 15:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59746986f52fd8872de7a4a66db79c8e SHA-1: 91477325c415aeaea47d0cc1d997e9038db21431 SHA-256: abc537e36c5ace9d1035d0100faf669a09562662695e95b7c558cf753157b1f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM". One of the primary URLs, 'https://traffset.ru/strik?utm_term=left+hand+piano+accompaniment+patter', is suspicious and likely leads to a malicious site. ClamAV also detected the file as 'Pdf.Phishing.Trojan', indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=left+hand+piano+accompaniment+patter
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f88ca6fe9571.pdf
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdf
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f9c46c0c0616.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e145a2a3-74c8-4e33-952b-7d4600ed430f/pevulozo.pdf
    • https://s3.amazonaws.com/baxadelefofibuz/wazorenarilefozev.pdf
    • https://s3.amazonaws.com/xanebavifamopez/should_i_staple_my_resume_or_paper_clip_it.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/admiral_dryer_lnc7764a71_manual.pdf
    • https://s3.amazonaws.com/fajonubinomeder/captivated_by_the_greek_julia_james.pdf
    • https://uploads.strikinglycdn.com/files/8cdd72a9-7f05-4f5b-a264-921a6f9490c3/fazerativabobabuzukozalaw.pdf
    • https://uploads.strikinglycdn.com/files/38125a54-76dc-486d-bdfa-bcd22713bfea/bosch_router_template_guide_lowes.pdf
    • https://s3.amazonaws.com/lixuzo/wooden_platform_white_heels.pdf
    • https://uploads.strikinglycdn.com/files/f74934dc-0bd6-4619-86bf-4d1140b1b526/83082241622.pdf
    • https://uploads.strikinglycdn.com/files/f37041c8-d18d-40e3-8a1d-ec42a1e7f66f/fejokelowag.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_off0000d35b.bin
28d4ad30f70ade5e57cca73d320cd1346221c317786ea9023f1b52c285880a86
pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 5128 bytes
font_01_sfnt_off0000e4ab.bin
fd04290dcc68656df27505394eaf4886d9f564e168a8fadd10ee6b40822c4d29
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 11020 bytes