Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab34c18b3cb33c73…

MALICIOUS

PDF

71.0 KB Created: 2020-12-03 21:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f56ee97a27b7036b1bb49f9af5f12982 SHA-1: be29a6de4c519db0a74cce7bf1103f1d5303839e SHA-256: ab34c18b3cb33c73b475041bd6d31595a41a524e2a2128eedfd1ccedb3691e9a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to benign-looking PDFs, suggesting a link farm or SEO poisoning tactic. One of the embedded URIs, 'https://trafffe.ru/123?utm_term=fire+emblem+anime+opening', is likely the primary lure, attempting to trick users into visiting a malicious site by mimicking a search result. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

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://trafffe.ru/123?utm_term=fire+emblem+anime+opening PDF link annotation
    • https://nanagimub.weebly.com/uploads/1/3/4/6/134632235/5cd266.pdfIn PDF document text
    • https://vutifiruva.weebly.com/uploads/1/3/4/5/134595151/natetajebajex-datirasulixi.pdfIn PDF document text
    • https://dowikawi.weebly.com/uploads/1/3/4/7/134741621/sorologejixoluzopaja.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/vusujopixolufuw_vizer_lajiguwuvijuku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/mariachi_sheet_music_violin.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/chin_na.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/gcuf_date_sheet_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b95a80b-5cce-4961-b6e2-df820b73e1b6/45099353576.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/makkar_ielts_speaking_cue_cards_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/maternity_leave_letter_template_ireland.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/tv_guide_listings_tonight_indianapolis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385b1744-ccf4-419d-8641-4b52130df3a1/osmosis_and_diffusion_lab_dialysis_tubing_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0297e85-caf9-4c15-ad89-993c9409b834/14682967886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f986a0-f30a-4f75-b9b5-596a9d93cf6d/grim_dawn_shrine_locations_act_1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 4764 bytes
SHA-256: ce048f8d401410bb8d67d174f187c00e745f69ddfca498e2559740ef4c01bd7a
font_01_sfnt_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 10284 bytes
SHA-256: 4cb44fea4969afc5b3fd6b4c59a3aad06a410fd1ec77d49234a501171ecdfa37
font_02_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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