Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f49e8dbd78def4…

MALICIOUS

PDF

50.3 KB Created: 2021-03-17 18:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f474494409811ed7350aa8814e1f3ffc SHA-1: 40c5f7f2f5d68228890c4f17ebabbf570271b6a5 SHA-256: 57f49e8dbd78def45d4752d3fb7339cff203a4368aa1ae108ef11a88e4a80ffa
204 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-heavy nature and a single clickable action. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

Heuristics 6

  • 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
  • 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 50 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://gimoguvi.ru/award?keyword=joindre+pdf+facebook
    • http://nunobuzipame.medianewsonline.com/luxakowu.pdf
    • http://suwufexez.sportsontheweb.net/39178952633.pdf
    • https://cdn.sqhk.co/runetonorox/dgiRjaF/sokotolenov.pdf
    • http://muzesumulel.getenjoyment.net/tafobenugovixelufixojejek.pdf
    • https://cdn.sqhk.co/jimavidozeze/2hcaZOE/8276586359.pdf
    • http://gelonixaj.rf.gd/online_business_plan_template.pdf
    • http://lowazuxakosilal.epizy.com/microsoft_sculpt_comfort_keyboard_and_mouse_driver.pdf
    • http://junenizexi.epizy.com/jafaxoxekuxibobotowoni.pdf
    • http://bagegamejejupu.epizy.com/50190129443.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_f92f4324524e45b8a302b4f400e765ca.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_edf9deb9e4c847b4a45feaad5bc832c9.pdf?index=true
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_ca0c0d32f740432db566d9cb35cebb29.pdf?index=true
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_7c42ff5699584b3790974182e544b665.pdf?index=true
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_e4abec6aaa824a4180a20a52cd702ac5.pdf?index=true
    • http://sovogezo.atwebpages.com/pobumizeni.pdf
    • http://zibelasavu.atwebpages.com/nuxijiw.pdf

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