Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc9503201cb7123…

MALICIOUS

PDF

81.3 KB Created: 2021-03-04 01:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b0e6f1fdb5f1fe57e538ce883d25ad SHA-1: 5c3c0b6977d1104a3b7b5890014ecab92624108c SHA-256: ddc9503201cb7123be79511fa41c4fddfdaf746c82cf8379862cecae370323f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=celebrity+voice+changer+apk+ios
    • http://apsdd54gfv.xyz/38093604068oe2wb.pdf
    • http://dkmz1.club/food_safety_manager_certification_exam_onlineqj9t9.pdf
    • https://bafuselowazela.weebly.com/uploads/1/3/5/3/135318440/d26392f3.pdf
    • https://nirumoxizexajiv.weebly.com/uploads/1/3/4/5/134524745/sarorefevabota.pdf
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/9170720.pdf
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/werasilufirikaf.pdf
    • http://pixell.store/lirefoxoremekakafflnh.pdf
    • http://volosaty100.xyz/propresenter_cloud_reviewhjq9w.pdf
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/4910744.pdf
    • http://sabuxaki.22web.org/portal_knights_guide.pdf
    • http://fullpisetc.ru/pearson_precalculus_textbook_9th_edition1xqdx.pdf
    • https://puziwurawube.weebly.com/uploads/1/3/1/8/131871408/sazax.pdf
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/tasekodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kixasudasiwub.epizy.com/paxituxawi.pdf
    • https://s3.amazonaws.com/tobojelusiwi/57079212711.pdf
    • http://rawonisobux.rf.gd/how_to_assemble_sole_e35_elliptical_2019.pdf
    • https://s3.amazonaws.com/donukadizolin/jimapabulolobatapilonas.pdf
    • http://kakogajoxe.epizy.com/56627646331.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd9.bin
5f03d2c6bc08d28d18892b3fd5153044a2fff6aad81dd629dfd07635bf6cf50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 2880 bytes
font_01_sfnt_off0000f616.bin
084a33f21dcfb5fedd5b4aba80ab1f725da3bdcf30f8144f9c606fe045ee98bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 5464 bytes
font_02_sfnt_off000108af.bin
ff824c5326733e70ef365295f107078f9a15b308fe44dda9f9e15a9d47879758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 14996 bytes

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