Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf0dd7c89d7f384…

MALICIOUS

PDF

96.2 KB Created: 2021-04-25 05:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aa67adf50a134e732e56506fc25af64b SHA-1: 21122759234ffe8f3b353c22f55eec49779c2bf0 SHA-256: ccf0dd7c89d7f384f4d1e7c80dcfff7246f8335ed96fe21cf10ad0838fb5fd3b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a link farm with numerous external URLs, including one pointing to 'jacksth.ru', suggesting a phishing or scam attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of embedded URLs and the link farm structure indicate an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=the+servant+james+hunter+pdf PDF link annotation
    • https://cdn.sqhk.co/lixepupo/5GIgei1/4521980648.pdfIn PDF document text
    • https://zolununib.weebly.com/uploads/1/3/0/7/130738801/nenuvonivip.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/639d5d.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/jjeeea7/vokuwewokaxe.pdfIn PDF document text
    • https://tegomufowake.weebly.com/uploads/1/3/5/9/135958876/5ae054.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/ajhc0A9/assassin_s_creed_2_pc_trainer.pdfIn PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/ab8394e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_dec0ae4a77da4e5188bb8af220507774.pdf?index=trueIn PDF document text
    • http://sujosivetobifir.epizy.com/womofosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46242804-0afb-4d4e-8e56-0cee38010072/pobikuduxawusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380b05bd-bf34-4c93-9475-ede79a348570/how_to_refill_ink_cartridge_canon_ip2770_continuous.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/pakistan_studies_notes_in_urdu_for_class_10_chapter_8.pdfIn PDF document text
    • http://gekasudevij.epizy.com/aprender_frances_basico_pronunciacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d475c7fb-c314-4305-a559-6b6256da9216/970a_g46_manual.pdfIn PDF document text
    • http://vibesegajepo.epizy.com/abituriyent_jurnali_2019_yukle.pdfIn PDF document text
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_46e9a2d12c064d93a8dbb100910b94ba.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_cdcce7d95f1445bdac03f5c4d1eea0d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0be24f-ee85-477b-958b-ede9ea913334/the_neverending_story_2001_dvd.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/what_is_the_difference_between_the_old_and_new_testament_catholic.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_0692a2e4ba3d405dbf39758ea986b0fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/vsco_photoshop_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/riddles_in_english_and_their_answers.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_43baa9d513a340d1b51eb5f86d4c5bfc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/99963281401.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_off00013b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 5336 bytes
SHA-256: a08dcb73e09cfe4ada70a97fa2415d4e52167a3c94a89b4aa237249b0dcb20b7
font_01_sfnt_off00014da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA0 11060 bytes
SHA-256: f508a14a410d10e296ccf015c1b1f6b2e0cc70b5462962e6ac9ce6fbd13f8031

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