Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6a82ba7b82ffee…

MALICIOUS

PDF

69.3 KB Created: 2020-11-16 13:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e703bff6b664e86ec300a2b77025bd34 SHA-1: 97f610d43932fd00ed1ed3a8dee60c29e766951d SHA-256: fe6a82ba7b82ffee5fc204cd8ddbc25e52f0d1ae78aca409e1b0be68659825ae
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'https://trafficel.ru/123?utm_term=do+crabs+have+hearts', suggesting a link farm or phishing attempt. The presence of numerous S3 bucket links, some marked as benign and others unknown, further supports the link farm hypothesis. No scripts were extracted, but the PDF structure itself facilitates the redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafficel.ru/123?utm_term=do+crabs+have+hearts PDF link annotation
    • https://timitadenemegi.weebly.com/uploads/1/3/4/7/134728598/gajafixekizud-kizag-bitaperiwuvi-vedenixoxivarib.pdfIn PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/josamodaxulep.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/luwali.pdfIn PDF document text
    • https://nojarotawufa.weebly.com/uploads/1/3/4/3/134313922/punojuditowed.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/notanomuven_damapikimiga.pdfIn PDF document text
    • https://wabalunizuwa.weebly.com/uploads/1/3/4/6/134643533/keridijivul.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/tovajete-boriva.pdfIn PDF document text
    • https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/0a3189f944f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/dunning_letter_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/android_studio_gradle_wrapper_location.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/ios_236_v6_installer_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/74075240680.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/21921206140.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/13546851753.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/monster_hunter_world_black_screen_on_startup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 5052 bytes
SHA-256: b752d2a30ecbdbfadb5e488bb1046f1150dc5c91009083c2d660e2b2334ba77b
font_01_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 10032 bytes
SHA-256: fa6ea4f7b89ee0e5ac2b282e06de246aab029a4eb4cf8613a1c452f45198db20

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