Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e37ed5e19d0e8e1…

MALICIOUS

PDF

65.8 KB Created: 2020-12-30 04:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d278cd7ee45dc31583e9ce5469bc82d4 SHA-1: 75608a767b321b4de29bd2da4c4a5b0b46ab3ddd SHA-256: 3e37ed5e19d0e8e1627fe83614526dbcf89596b93693dc93f7266b1b9e0423b1
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a malicious link farm, containing a large number of embedded URLs pointing to potentially harmful content. Heuristics indicate it's a redirector link and a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, identifying it as a phishing trojan.

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://ggtraff.ru/123?utm_term=dawson+boyd+schools+camden+conference In PDF document text
    • https://cdn.sqhk.co/fopujetoros/JohgUic/fast_cars_racing_on_highway.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421042/normal_5fdd5bf48b4bd.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/hgje8IS/zelurozedonopo.pdfIn PDF document text
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/nigitadux.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/Bhjdhji/mubedubedoz.pdfIn PDF document text
    • https://lusovajilabijix.weebly.com/uploads/1/3/5/3/135351537/ragewadazomog.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jfhchbG/79001186087.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/iic4ghU/fapakajosoderozomesuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5fd60b6f30ad4.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/9e49b.pdfIn PDF document text
    • https://nodemexawek.weebly.com/uploads/1/3/4/3/134331915/wafafunaxa_simapuxevazux_jilajidivud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5fda0e35e86c6.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/a2d1568.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/37505373539.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/english_workbook_grade_3.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_off0000b7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B8 5256 bytes
SHA-256: c0bb1700ddba55243bb546f33d73ab4eacf5412e8cf0dbc502280348209eb1f8
font_01_sfnt_off0000c970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 10220 bytes
SHA-256: 0cdd6d3c4389689dd9595588aab54340daad67a63c5a39e35926369d0cb36667
font_02_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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