Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2a884b9c854f0c…

MALICIOUS

PDF

75.2 KB Created: 2021-05-15 06:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 035b28848ef832e26080b6783bba4502 SHA-1: 7dafe895bf0368ba69316fec8e050e614c7ed4db SHA-256: 6f2a884b9c854f0cdcb0350e4c9f5f6482a25fc1343d21402dafb249a0e0e401
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many of which are likely part of an SEO link farm or phishing campaign, aiming to redirect users to malicious sites. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous external links and the heuristic firings strongly suggest a malicious intent to redirect users.

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=dungeons+and+dragons+monster+miniatures
    • https://cdn.sqhk.co/xonepogafix/aCZgfhe/nintendo_switch_online_redeem_code_not_working.pdf
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/jukamaduwakivewar.pdf
    • http://zamowafa.mywebcommunity.org/forex_candlestick_patterns_strategy.pdf
    • http://dikegebe.mygamesonline.org/bovadulaxifamijikamamu.pdf
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/5319705.pdf
    • https://cdn.sqhk.co/goxobuve/cgeKOJM/19111154202.pdf
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/rumuseni_zufudadaloduvap_wapoveg.pdf
    • https://cdn.sqhk.co/tuxonewebuke/gOGC7jg/los_picapiedras_traducir_en_ingles.pdf
    • https://wujatukeki.weebly.com/uploads/1/3/1/8/131856991/726027db.pdf
    • https://fazozojoxupu.weebly.com/uploads/1/3/1/1/131163788/jinuwezuvumukoxuz.pdf
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/8afa35db.pdf
    • http://sozapemogoz.mygamesonline.org/41600823894.pdf
    • http://xunetokawetik.sportsontheweb.net/biological_hazards_in_food.pdf
    • https://cdn.sqhk.co/zupuguvawaj/gjkimha/dining_room_sets_near_me.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kosezofejesuxef.atwebpages.com/budededidasamibokepawugi.pdf
    • https://s3.amazonaws.com/lovomijelun/ctet_question_paper_2011_with_answers.pdf
    • https://s3.amazonaws.com/norozovijalu/zugemanegeloduxum.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_off0000e7a6.bin
802c5b000620e67b3561f62a297c0a5687aead25708036ea227cd2dadd492d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 5112 bytes
font_01_sfnt_off0000f8fd.bin
5078ac9c29aa711607ea27199d2c6fc9cde3cc163122f8ff501ada678d7f8603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 11404 bytes

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