Malicious PDF — malware analysis report

Static analysis result for SHA-256 7962167e0f28f946…

MALICIOUS

PDF

77.6 KB Created: 2021-04-16 07:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 157699a69660ab27893edb61d89b071e SHA-1: 53e8df75dafc457251db5e538e9c5dbf0089c13c SHA-256: 7962167e0f28f9462c237e82a4335fa7540ee78ba3758255c7ba28ccc2126cf8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded text and heuristics indicate a lure for downloading a dictionary application. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=longman+dictionary+of+contemporary+english+for+android+free+download PDF link annotation
    • https://wolazana.weebly.com/uploads/1/3/0/7/130775510/tametokisezoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/hajgifB/jutenukazuxak.pdfIn PDF document text
    • https://mitogisavubok.weebly.com/uploads/1/3/4/0/134019676/ladapejofufeme.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/istgi4g/warajarufixit.pdfIn PDF document text
    • https://cdn.sqhk.co/soxosovave/diegIim/matchington_mansion_cheats_level_405.pdfIn PDF document text
    • https://rejonogatu.weebly.com/uploads/1/3/5/3/135392998/b50bde6c3078867.pdfIn PDF document text
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/8347116.pdfIn PDF document text
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/kosuwev-kefur.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/648144.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/i9ggidx/frases_de_amor_propio_para_fotos_tumblr.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/delanibofuniza.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/jEWijgg/head_soccer_2019_la_liga_mod_apk.pdfIn PDF document text
    • https://togawakavepanef.weebly.com/uploads/1/3/1/1/131163752/75fee6a0ef1b.pdfIn PDF document text
    • http://baltika-trans.ru/4046929585rxskb.pdfIn PDF document text
    • http://purpless.vip/kevifumpsrsc.pdfIn PDF document text
    • https://menufaron.weebly.com/uploads/1/3/0/7/130775522/4864916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d0573c-e657-4863-b8c7-72149ea901f2/american_history_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371a0cd3-b988-44f9-a847-13a3d57ebea4/ferorigof.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_e70d1f53af9c46f3b90a8a7fe60ea5b7.pdf?index=trueIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_21b5bc3453f545e58aac26bdb5c86ebd.pdf?index=trueIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_c99ae6e6fa7d48d0b1a2486250d9c7ee.pdf?index=trueIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_853366e20e124de38abac1cec08db537.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_7c4bc62edea642e69cb72802155131f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0b9d41-d271-4fe9-bcc6-add28e815fad/53376040524.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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 5704 bytes
SHA-256: 6b5d503f44bea82a7c06878cbb960d66b4ed5912a2356fe1c94dd59885207859
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 12020 bytes
SHA-256: 58b898b38522f2cc68841194b0099ca4c7138f9b70e4dbf02833cfba297c33a0