Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8102c4236b338fc…

MALICIOUS

PDF

59.9 KB Created: 2020-12-17 01:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18e636ab490b49ac7bc0cd95cd95c67f SHA-1: 126bbea5f1c3531ce20affce07e7de0f29c9eb5e SHA-256: d8102c4236b338fc2dea803754f496d417823851f1f56b605ca240fb64498ab4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least two pointing to disposable hosting and one using a UTM parameter, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=lufkin+measuring+wheel+home+depot
    • https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/af488985729af3c.pdf
    • https://lotozuxefad.weebly.com/uploads/1/3/4/3/134316708/foxagujisuseruz.pdf
    • https://womafikuv.weebly.com/uploads/1/3/4/6/134668976/890570.pdf
    • https://vujuzujotug.weebly.com/uploads/1/3/4/4/134478410/tukuzimabiviru-vadifivekaj.pdf
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/9e1100a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5c5ef8cdb769c6da48bb/1606376543269/roland_barthes_camera_lucida_trke.pdf
    • https://s3.amazonaws.com/fizaxo/75151214386.pdf
    • https://static1.squarespace.com/static/5fc0e1448ef7301f8b1097bc/t/5fc164252dd96f59182384a2/1606509607014/sakugupuvejikas.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/69725087937.pdf
    • https://s3.amazonaws.com/tobito/ionisation_definition_chemguide.pdf
    • https://uploads.strikinglycdn.com/files/6f602fad-6034-469b-aaf3-2010ed7cd9e5/49830724516.pdf
    • https://uploads.strikinglycdn.com/files/3a2a22de-a787-4c3f-a32d-ae859136da33/planet_earth_caves_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/vinivuxo/free_christmas_email_signature_template.pdf
    • https://s3.amazonaws.com/henghuili-files2/54772777766.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea6.bin
5caf121242fec97dc310c711da6fe22eeac6a0d858275fd2cdf6e843a5c79929		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA6 5552 bytes
font_01_sfnt_off0000c179.bin
6503e087ae122d04a25ea83e191a70fe923b6f482bb0e46d87b502406a696e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC179 9804 bytes

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