Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d94631037a6cfd…

MALICIOUS

PDF

71.5 KB Created: 2021-04-11 23:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea9aebc26f36cef87b62d9e13616d60d SHA-1: 81e6067203a03a76ada5d158640a04ce5e1ac73d SHA-256: e9d94631037a6cfdf2ae5133dc9cdb7f2cc985de6491716dfce08153a1c6fd26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one identified as a potential phishing lure. The presence of a link farm heuristic further supports the conclusion that the document is designed to direct users to potentially harmful websites.

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-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/strik?utm_term=d%2526d+3.5+tiny+playable+races
    • http://surisetufuna.iblogger.org/99365378250.pdf
    • https://cdn.sqhk.co/madufuxenuw/1lHRKjj/fruitful_daily_checklist_habit_tracker_printable.pdf
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/jariwipow.pdf
    • https://cdn.sqhk.co/bitaxukezor/59b5n7P/ludigigapade.pdf
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/6227009.pdf
    • http://vumigix.22web.org/xiragepafugabadudijo.pdf
    • https://cdn.sqhk.co/matezafun/NBgcpJn/toptop_hot_pot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bevetobepo.rf.gd/what_states_do_palmetto_bugs_live_in.pdf
    • http://suxezuvovuwezew.rf.gd/fraction_bars_printable_free.pdf
    • http://savefativiluz.epizy.com/kopituvuw.pdf
    • https://uploads.strikinglycdn.com/files/b221c24d-d498-40bb-b4e1-69cd33e6e27d/cortisone_shot_acne_nyc.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/suravokabepegeg.pdf
    • https://uploads.strikinglycdn.com/files/419a5384-ec41-4b29-b60a-76e0c5112c9c/88295046414.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/daworebunesune.pdf
    • https://uploads.strikinglycdn.com/files/01411a74-45bd-4998-a67a-c17c70daa5e6/whats_the_best_jump_rope_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/c13c787d-f014-4cec-a786-5aeddf2f1700/wajemakujenin.pdf
    • https://uploads.strikinglycdn.com/files/43ae2c7a-9125-4180-80b5-edc9d732a630/janojudadenokinad.pdf
    • https://s3.amazonaws.com/xixonu/limpopo_weather_report.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_off0000df0d.bin
bb1702a9e9b617346157f9ea6f36cc14559c37d4a4a2cf683ebd57dce9d2c082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 4156 bytes
font_01_sfnt_off0000ed3c.bin
4c37abb0b74efe3c1bb239c648ceb9e4e891d9112a7bf3697f69d4369195d619		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 10644 bytes

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