Malicious PDF — malware analysis report

Static analysis result for SHA-256 73852c972fc722c6…

MALICIOUS

PDF

63.3 KB Created: 2020-12-19 19:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33e9b9b39beffa80ecee3c193f454069 SHA-1: 12d2426c607fac56ed0c161f5cbc5b533f03d536 SHA-256: 73852c972fc722c65c3193bc3d76eae2d10e3feefe2c1ed97da2735cf7446823
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attempt to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=head+soccer+unblocked+full+screen
    • https://static.s123-cdn-static.com/uploads/4388165/normal_5fc9a38457921.pdf
    • https://zumavoga.weebly.com/uploads/1/3/1/3/131383266/xopaleb_jamuj.pdf
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/buvexetokerikevodoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zozuxukoxo/xakatopojugugumurogusus.pdf
    • https://uploads.strikinglycdn.com/files/80840597-5b01-4fef-91bd-202d379fa335/guayaba_como_se_come.pdf
    • https://s3.amazonaws.com/zafijukopa/piya_basanti_full_hd_video_song.pdf
    • https://s3.amazonaws.com/fedufiporara/donjon_et_dragon_5_guide_du_maitre.pdf
    • https://s3.amazonaws.com/kegubinefuda/what_is_a_computerized_spreadsheet_program.pdf
    • https://s3.amazonaws.com/zedudo/pathfinder_bull_rush_off_cliff.pdf
    • https://uploads.strikinglycdn.com/files/780f6c5b-a53f-4019-a9a0-f5c83b49cdf8/concepts_of_genetics_11th_edition_test_bank.pdf
    • https://uploads.strikinglycdn.com/files/6b0448a7-5740-4328-8fb2-59988c42c880/1768768229.pdf
    • https://static1.squarespace.com/static/5fc0e526c6229360ecacefcf/t/5fc25ae7f3de5e49b5b0f64f/1606572776928/wizard_feats_pathfinder.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_off0000bb4f.bin
d4fe75872a33095b79b7db86d5d77fdb00401c00ca7f29444c086ed8fa2d1fe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4F 5180 bytes
font_01_sfnt_off0000ccf6.bin
611d3784337e5037f882554428554345a35f5370c1a9f3b62e8e856651283527
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF6 10448 bytes