Malicious PDF — malware analysis report

Static analysis result for SHA-256 acedf745a478ec85…

MALICIOUS

PDF

60.5 KB Created: 2020-11-12 14:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c990d5706703a552aad4e5ee7c5afacf SHA-1: 1e66cb7c80522a1df11d720eb3c3ba1bb416af41 SHA-256: acedf745a478ec85e805446a9e818b5051db8f012c48880b051a04f561ee269d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those hosted on Weebly and other platforms, suggests a link farm or phishing campaign. ClamAV also detected it as Pdf.Phishing.Trojan. No scripts were extracted, but the PDF structure itself points to malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://traffset.ru/123?utm_term=coleman+pools+owners+manual PDF link annotation
    • https://dewasujule.weebly.com/uploads/1/3/4/3/134340999/5038576.pdfIn PDF document text
    • https://nefositasin.weebly.com/uploads/1/3/4/3/134310380/8705037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_5fa0b165c4c39.pdfIn PDF document text
    • https://tefidimigeb.weebly.com/uploads/1/3/4/3/134319466/3441858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_5fad280006191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f984d2aac4fe.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/woxabusukujawe-vanodozofajesa-wanezine.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/pugomonapoxuxe/vobixazawulul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d10b60f-6919-48a5-8235-6700ac6a53f4/skyrim_live_another_life_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cc4c93-2dfc-47c9-bb17-022a3525df10/pokaperawofuxonaxijutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4058333-b143-4d55-8bce-78a63b78b388/69404283741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc802273-9b4d-4c52-be95-0729e8066404/39177735675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8232d7a4-99be-4a5a-bd4b-c1c077a89f9e/38027224001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1efebe-52b7-491f-b30d-ddecb6cb4bbc/nalupoxirigezajijanegona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6203cc3-798e-4d72-ac35-eb55c03d7ca0/22758279087.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB170 4964 bytes
SHA-256: fa8842efb6e708453ed9feb435887e5e2f1f8349547b791ecf3c02d3fd1e2677
font_01_sfnt_off0000c23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23E 10260 bytes
SHA-256: 5de1e62c470cfb7711c5f6e8a4d52e49ab869ccde0f53a1059962b39c8e2f8e4

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