Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ce4ae6c4d6b32e…

MALICIOUS

PDF

78.7 KB Created: 2021-04-10 22:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f2fed3acd79594f091eb95d20074c40c SHA-1: 5790193648da2e0ba2a6243ed90b7d9c625c695a SHA-256: 69ce4ae6c4d6b32e0bc2d42c498f1bb7c600e19ead8a3c1cc2f924325fe51f5f
186 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains a significant number of external links, many pointing to disposable domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm, and the presence of a 'utm_term' parameter in one of the URLs suggests a phishing or SEO manipulation attempt. While no scripts were extracted, the overall structure and URL distribution strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://pelibifir.ru/strik?utm_term=how+do+i+type+letters+on+my+iphone+keypad PDF link annotation
    • http://microbladingeyebrowsdallastx.com/72368720720fpei7.pdfIn PDF document text
    • http://carbackseat.site/595333997691h801.pdfIn PDF document text
    • http://aycotoro0.xyz/748227137025ozfb.pdfIn PDF document text
    • http://gnoogle.site/romance_of_the_three_kingdoms_book_reviewy9eli.pdfIn PDF document text
    • http://iclod.tech/luces_de_bohemia_pelicula_reparto0utve.pdfIn PDF document text
    • http://onatural.space/sat_practice_test_1_math_no_calculator2pr95.pdfIn PDF document text
    • http://ersoil.fun/xuwonenige0qc3a.pdfIn PDF document text
    • http://8bitbeardsco.com/bisenumvl90.pdfIn PDF document text
    • http://politach.com/sudofiwigedidogezepkghrd.pdfIn PDF document text
    • http://runolive.com/freaky_friday_musical_sheet_music0bn00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_2fb5e28011c1427984160442edbfdf89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e410022-1666-4b40-acf6-be037bf28c3b/refrigeration_cycle_ph_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/nutrient_dense_diet_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/79202248245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f36f8c-034a-4f5b-8b48-9a8f4b69a366/91844879432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961c8359-8530-4449-aa6c-6b233f5590cd/classification_matter_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5efbdb-6de8-472f-a940-2660185f49c7/gramatica_en_ingles_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b728f937-f1f6-4334-95f9-9708795d838c/94761269665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a41faf6-9974-4948-aa35-e64a80171cd7/what_is_battery_energy_storage_system.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_4056643297a84b3c8161cd318af4078f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9167c5d4-07b4-4344-be71-c663632f8c9c/is_huckleberry_finn_in_tom_sawyer.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_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 5416 bytes
SHA-256: 2917788bece49b25777efa864394e228df817157c8b3967e329bd3ae39b744f5
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 10520 bytes
SHA-256: b2fd7d6261097d518d14da133e189efa9b27ebc8bedd0b65174640b1b512a6dc