Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d836bb67cb940d1…

MALICIOUS

PDF

139.4 KB Created: 2021-04-28 09:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4eb180a936bf0edc56e3d243468d37c7 SHA-1: 805d2c8cdfa653ed6b75507f1bada287f83ae3dc SHA-256: 7d836bb67cb940d15d5549b1baa1e3441f6c48ea11e27814333e44af5ffe29b3
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://seumenha.ru/strik?utm_term=gravity+falls+journal+2+and+1', suggest a lure related to 'Gravity Falls' to direct users to potentially harmful content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=gravity+falls+journal+2+and+1 PDF link annotation
    • http://rilizikurejoru.22web.org/67274756659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_6043a2ede0390.pdfIn PDF document text
    • https://kovajokuluvemu.weebly.com/uploads/1/3/5/3/135335912/3159f.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/how_old_do_you_have_to_be_to_get_your_cdl_in_oklahoma.pdfIn PDF document text
    • http://sofofal.iblogger.org/40983362722.pdfIn PDF document text
    • http://vesixadaw.22web.org/sb_800_new_construction.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_5fdbfc560d76a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_60499af1a341e.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/4594067.pdfIn PDF document text
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/a7df97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_6011e7cb6cc4a.pdfIn PDF document text
    • https://samazixudoreput.weebly.com/uploads/1/3/2/6/132681586/xorosogoza-wodafewi.pdfIn PDF document text
    • http://paradusafe.iblogger.org/alaska_board_of_nursing_contact_information.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/wolutun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/9636708054.pdfIn PDF document text
    • http://xuvunemomot.epizy.com/82009033285.pdfIn PDF document text
    • http://zowisojaba.epizy.com/paracetamol_induced_hepatotoxicity_in_rats.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/vitedaniruko.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/poronododavadized.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0001d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D32B 6588 bytes
SHA-256: c6acebe3750ab55c09714fa1b34f6c70ddae3ce202e1a088ffcbc34adab53285
font_01_sfnt_off0001e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3A5 5352 bytes
SHA-256: 588c30843d932d8086c79656e3ed36ac0649d5a3554023afa2e0bdd570648421
font_02_sfnt_off0001f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F608 12624 bytes
SHA-256: 01cf49ce11f94ac5c7dd728dd1612fe4b6bb336f9953ff46e915ddcc0459e5ff

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