Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05083020f2d5dc0…

MALICIOUS

PDF

77.9 KB Created: 2020-12-27 12:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e29fd5e5fa1dfb1b7a7195580a1edce3 SHA-1: e6aca35502b728c75ea6b0a81e5e51fb89c1ae16 SHA-256: c05083020f2d5dc03f477ea3f288f9622ebd4f38bd0c39ea57f3f6a2b7de1969
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of links to external PDF files hosted on disposable domains, indicating it functions as a link farm. One of the primary links directs to a known malicious redirector, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/strik?utm_term=what+does+clue+cells+in+urine+mean In PDF document text
    • https://mogunugive.weebly.com/uploads/1/3/4/3/134381007/d36343cb16a.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/kiajejh/59813044913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f901558eb813.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/jKgfhfq/magic_piano_mod_apk_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_5fd3184b10120.pdfIn PDF document text
    • https://sidopaxabu.weebly.com/uploads/1/3/1/3/131398246/gokekubeg.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/jdYgjN2/bogigidekonijadez.pdfIn PDF document text
    • https://ludabasekid.weebly.com/uploads/1/3/2/7/132740342/a39ba2a.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/8phdz1o/34221203879.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/Kzjaje8/67338051364.pdfIn PDF document text
    • https://nadaxujapowa.weebly.com/uploads/1/3/4/8/134891343/niwapegimogip-sizesemo-jepufuz-dirusu.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/esZsiec/78667544227.pdfIn PDF document text
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/xuluvosivojamowanup.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.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
    • 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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 5072 bytes
SHA-256: 3dc9537d93792d4ab4cb328105262faaf5ac332162b6949ff001d1ffab136070
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10712 bytes
SHA-256: e70aab876f5ec2be30b19a72434e79f28d226dffab0afc1a147ee6f3cd8c5dad
font_02_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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