Malicious PDF — malware analysis report

Static analysis result for SHA-256 44789a48e5337935…

MALICIOUS

PDF

75.0 KB Created: 2021-01-03 06:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c9bc2e82c58f3eca50c643b5fd9f3d4c SHA-1: 9c5d7e453ff97a5a1bc8398a09d84bbbd3c62315 SHA-256: 44789a48e5337935fa28df67e23bd44121d13a9e89f0c751ea4ffe3743f4fcc1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=sample+accomplishment+report+for+teachers PDF link annotation
    • https://fiselowozol.weebly.com/uploads/1/3/4/3/134366189/3e243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f87f8a8e0afc.pdfIn PDF document text
    • https://bezawilunopas.weebly.com/uploads/1/3/4/7/134722101/5513285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471988/normal_5fc70d27c2b6a.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/8335667.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/lopumewit.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/wovaviroruwuvi.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/wokegojij.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/2608043.pdfIn PDF document text
    • https://jisevudes.weebly.com/uploads/1/3/4/8/134882916/9d917f66d28.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/3100f0db3a1.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/wixanarer/heart_of_darkness_part_1.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_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 5356 bytes
SHA-256: dc24b934f585dd97037abac772f26db62e8a3208999a3843d4f3db5f1d8cf337
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 10904 bytes
SHA-256: f051a2d3f306b527e43915af808d3851c41461c6d3951a87556d688c2f6ea757

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