Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48dc3d185fa9a9d…

MALICIOUS

PDF

71.1 KB Created: 2020-11-18 00:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c1d022287c0450413fb78530c7b98a9f SHA-1: 179904953996f7af8648779a30112a076723e670 SHA-256: e48dc3d185fa9a9db2e220bd63ec1f304759138d3a55ab200a398f23c518abef
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the use of disposable hosting and UTM parameters, common in phishing lures. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/strik?utm_term=aplicacion+de+integrales+en+la+vida+cotidiana PDF link annotation
    • https://setekonireza.weebly.com/uploads/1/3/4/1/134131298/5a2d7.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_5f98efe8da452.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/mosazexoveget.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/a845a6c3daf.pdfIn PDF document text
    • https://nimimemuxigu.weebly.com/uploads/1/3/4/4/134488465/kipinegatibujop_bazafuw_zofig.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/fdf17a0.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/bf332cf1-c9bc-4cdb-b30b-495541cce9bf/rpm_speed_and_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a37b98-9c81-4b90-add1-510cd0e0fbfb/42972842838.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/maplestory_corsair_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/5128126556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024d489b-e410-4db6-810c-61eed431ad40/34080613396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37b8c16-c4b5-480a-9a8c-2f2bcf6ada9d/destiny_2_a_weapon_of_hope.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_off0000cb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 5288 bytes
SHA-256: 367cc8422b6d3885ce5520b2d2ccd76a2498cbad0adcbf018db6dc0a1808884a
font_01_sfnt_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 2084 bytes
SHA-256: bf4c9d9a6cff1c5f19e719bddcebfdedcf3018debda5afadd3d81f2ba212a91a
font_02_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 11860 bytes
SHA-256: 1ba667a3b8bf31d950bb44621dc781a5e61e5a872c94cc3f408f7294e1aa1dc1

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