Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3d3df506a24022…

MALICIOUS

PDF

79.2 KB Created: 2021-01-02 11:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d33e291dd6898a39fd1701e7b22e44dc SHA-1: 74e9cd40ee954a07ce9258769dd84603ac762380 SHA-256: 7e3d3df506a240226fd72fc2b22b0f173d727b11d94dd0e5a2cb7737b530b799
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm designed to drive traffic. One of these links, 'https://traffmen.ru/123?utm_term=raw_input+python+2', is identified as a malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the link farm structure suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=raw_input+python+2 In PDF document text
    • https://cdn.sqhk.co/birenejar/iepjaz8/romantic_couple_stickers_2020_for_whatsapp_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5f887d15b5a07.pdfIn PDF document text
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/kofaxede.pdfIn PDF document text
    • https://dujizozobalosu.weebly.com/uploads/1/3/4/4/134470010/zomunawutoxirewewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5f99b1833be16.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/wawet_fekonavu_ditesuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fe62a9311144.pdfIn PDF document text
    • https://debaduvevuw.weebly.com/uploads/1/3/4/3/134383420/fixug.pdfIn PDF document text
    • https://jetizapu.weebly.com/uploads/1/3/4/3/134371104/352efef51f6.pdfIn PDF document text
    • https://cdn.sqhk.co/xinovupu/Nlich91/86754493299.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/pajeriramal/bamboo_shoots_guide_acnl.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/ladizuxulosulamolumukowe.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_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 4964 bytes
SHA-256: 0284086e79dee35248f90606aa43a8150e03a620025212a64bd232cf0ab17096
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 10892 bytes
SHA-256: 02992d51b74cd041fd9cee5a5b7a9468bb56a822e78b97b02d0ad697a732a299

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