Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4def1f63140569a…

MALICIOUS

PDF

81.3 KB Created: 2021-04-24 19:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 45bda32f6922dc243794a37cd85b5443 SHA-1: 1390c98835a73bc4289015fe89b3bc56562c43f3 SHA-256: b4def1f63140569a803adc2b9850df448cebe08d00f80a037364beb417f1f490
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'Shimano become dealer' and 'wkhtmltopdf', hinting at a potential lure related to product dealerships or a technical pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=shimano+become+dealer PDF link annotation
    • http://ppl-nutrshopfit.website/jalobizopidajiga4qvvx.pdfIn PDF document text
    • http://hellesypakk.online/why_is_recycling_water_so_important9hcav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5ffbe19948bbd.pdfIn PDF document text
    • http://jushq.club/how_do_i_file_a_claim_with_asurion_sprintc2bv5.pdfIn PDF document text
    • https://lipijubirenazob.weebly.com/uploads/1/3/4/7/134722159/72ab1.pdfIn PDF document text
    • http://fbcopyright-center.com/816984802525v2i2.pdfIn PDF document text
    • http://tegor.xyz/95100278832tcxza.pdfIn PDF document text
    • https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/nitawunevenewij.pdfIn PDF document text
    • http://prizinsta.online/89203207561mfn04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478148/normal_6003ae0f4d0ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_60251c9360637.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_606b4d4699887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_6068077554034.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/zerejibixupav/daru_badnaam_song_video_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9121c19a-74a7-4813-9217-7e2faf5659a1/what_is_the_order_of_the_wings_of_fire_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2481cdab-bb96-46e7-8603-ddd195ee507b/35834550643.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/93233305959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b414c82a-5716-4fb4-aaad-4a301c8bca1f/68116257690.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_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 4952 bytes
SHA-256: 8684f371bd800d73b2445a4573dc7f92a3cc6619b57906680ee8867b1b43a835
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 11148 bytes
SHA-256: 167cb19c0d46e77ea4487012d53f25724ce750291ace2cc544151111853b58d5
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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