Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2b822ea8e720cc…

MALICIOUS

PDF

72.5 KB Created: 2020-11-18 18:34:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff6efa64bcc06c6d075c8a7107efbbdc SHA-1: 53baac608ee9fca2e43ac4842fdba0e3dc63f791 SHA-256: 9a2b822ea8e720cc8a3d32f31657837503978e99c2437a039a7ccb21328b9bf1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://mamonesobekemi.weebly.com/uploads/1/3/4/3/134320903/lanikubadusenubuvi.pdf'. The presence of ClamAV detection and an ML classifier flagging the PDF as malicious further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=2014+ap+calculus+bc+free+response+question+5
    • https://mamonesobekemi.weebly.com/uploads/1/3/4/3/134320903/lanikubadusenubuvi.pdf
    • https://gitapobukelagij.weebly.com/uploads/1/3/4/2/134266265/f8072.pdf
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/2107864.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/acba796e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mijedusovineti/46432436346.pdf
    • https://s3.amazonaws.com/tuzakifezara/financial_accounting_tools_for_business_decision-_making_7th_canadian_edition.pdf
    • https://uploads.strikinglycdn.com/files/d64e537b-8b81-4fa4-a346-9d8ef3c31da2/wajevuxo.pdf
    • https://s3.amazonaws.com/gosete/my_horse_sweats_a_lot.pdf
    • https://uploads.strikinglycdn.com/files/929df6d3-8b2b-47b7-aa41-f7674fda5393/busudumo.pdf
    • https://s3.amazonaws.com/likerajatob/xamuromabewadogukaku.pdf
    • https://s3.amazonaws.com/toguvaju/csgo_trade_up_contract.pdf
    • https://uploads.strikinglycdn.com/files/1a728836-63f1-43c6-bb1b-8ad72fce2f84/26469670693.pdf
    • https://s3.amazonaws.com/rejiner/igcse_biology_questions_by_topic.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf47.bin
288f64ff3413a1e83197d44685fcfdd7fcb964c1b08c6e8f2eda9907b4639786		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 5600 bytes
font_01_sfnt_off0000e259.bin
419d35b032998e33ae7e3222a3a25c49cbd89d687816ae7e97d4097d322c5ae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 10600 bytes
font_02_sfnt_off00010695.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 4324 bytes

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