Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc3817cf5bcbbc2…

MALICIOUS

PDF

83.1 KB Created: 2020-11-13 03:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6f65307320f22e641435d1180a18bee3 SHA-1: 10b82cc0458213364b4ce0c6724c89efe68f6fda SHA-256: fcc3817cf5bcbbc2eca5f7cb6fe9a3c1abe12440918de79dffa312b2e768d55f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffine.ru/123?utm_term=braun+coffee+maker+error+codes PDF link annotation
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/6770779.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/6452702.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/milowotuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f87008052f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_5f9f657429d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_5f9b60c855d73.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/rujizukekidomitazav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471095/normal_5fa78ee7b48f4.pdfIn PDF document text
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/187d70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5fa76b0eb6f2b.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/mukekumuwobalirimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fa1e0d4c6af8.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/893f01fd-2c63-4a80-8749-ac84f6d02b58/gigironixopexeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c0f79e-d243-4a34-97ff-0a101d6eda3e/92130305147.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_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 5248 bytes
SHA-256: 8431366143229740300d319f800e7ca81d962cdb6ed42e144b13ad1da07e6546
font_01_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 11068 bytes
SHA-256: 5f7a19921b652616cd0be4863054344b79381471bfe5d5f84ce489f3b9a87dd6

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