Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc6d4b724286ad0…

MALICIOUS

PDF

81.6 KB Created: 2021-03-24 13:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ef8e9e3f60a4a969e488debe8c4e38fa SHA-1: 4e859e4740a7bdf055af1934bab6ba81d504c844 SHA-256: adc6d4b724286ad04c58d6cc4c781535bfa4fd4e50caaf77b4ff9fe0f66f7bd4
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=lowrance+hds+5+gen+2+nautic+insight PDF link annotation
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/6233aa817f93.pdfIn PDF document text
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/2951549.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/jeibdgd/flickr_photos_free_to_use.pdfIn PDF document text
    • https://cdn.sqhk.co/pimetezefo/iidAshf/die_bergretter_episodenguide_staffel_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_6043360d74513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416496/normal_5fe2a9f08d915.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/9efd3.pdfIn PDF document text
    • https://fomofasagulak.weebly.com/uploads/1/3/4/8/134860280/3035179.pdfIn PDF document text
    • https://rasogumelix.weebly.com/uploads/1/3/5/4/135400304/a86eda4b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_60165f1d305eb.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/YpiiieN/litufawupoxowuzel.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/gurafoga/fabejuzamivisudop.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/ridisenujuzezusaxonikofiv.pdfIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_4f0422acfa634599962c6bf484fbd193.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_f15c695cbab044adaf38d49d87e507a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevelel/82857757323.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/ragodurufigen.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_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 5460 bytes
SHA-256: d34898f5b30d03232863014d23e792876186094aa85045ea547991b8a7bfa30e
font_01_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 2064 bytes
SHA-256: c4f350553ad6f77865904fb688ec4babb5155377b8188501ae78e3402c3410e6
font_02_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 11260 bytes
SHA-256: c627089364130a05f46e28a623d0b16ee07a258b3363c785add7ccd109b4737c

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