Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ba51da619cb0b8…

MALICIOUS

PDF

39.4 KB Created: 2021-04-01 08:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d0352007f4d48f8f64d79b188af76e7 SHA-1: 3c84c025ad922088a17798cf8e9b7b11de7f31d1 SHA-256: 16ba51da619cb0b8f82d0c134e071f6cc65bce3b7b89d026705c0b919abdafe0
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a phishing lure, masquerading as a Harvard acceptance letter to entice users to click on malicious links. The document contains numerous external links, many of which point to potentially malicious redirectors or link farms, indicating an attempt to distribute further malware or conduct phishing campaigns. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8477

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yafferge.ru/award?keyword=harvard+acceptance+letter+pdf
    • http://jobs-ingenieur.best/22675424602hme0p.pdf
    • https://cdn.sqhk.co/xavaxonad/a3hzppk/little_mermaid_picture_frame.pdf
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/632283.pdf
    • https://cdn.sqhk.co/pasededi/fgjifeG/bluetooth_ble_terminal_windows.pdf
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/ximunusatin.pdf
    • http://melodabogaso.66ghz.com/free_partnership_agreement_template_word_uk.pdf
    • https://nikakakuko.weebly.com/uploads/1/3/1/8/131871571/luxizulix.pdf
    • https://cdn.sqhk.co/bujiwamovul/geighfX/cheap_project_drift_cars.pdf
    • https://cdn.sqhk.co/tubafejog/Uge2qBr/ames_performance_center_burnsville_mn.pdf
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/5255125.pdf
    • http://pubggaming.online/cats_mod_apk_2._20._1u79nf.pdf
    • http://podarokinsta24.online/tosekaxumtns.pdf
    • http://rm-swis-mine.com/90219767059957v1.pdf
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/kotiwusosubep_vajusa_piduzotujelafom_netuvuvosu.pdf
    • http://kazesudivuvuf.rf.gd/23700506714.pdf
    • https://s3.amazonaws.com/fopalew/2018_chevy_malibu_repair_manual.pdf
    • https://s3.amazonaws.com/zebarufuridorur/16078286071.pdf
    • http://xuxevimikari.rf.gd/us_army_nco_creed.pdf

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