Malicious PDF — malware analysis report

Static analysis result for SHA-256 e940eaf44f6479a1…

MALICIOUS

PDF

70.8 KB Created: 2020-12-25 12:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 72a3959c0e2f092e2d20bfbb6ad19a7f SHA-1: 6dea6433c063e3b05d7c7677afe1055999a96c62 SHA-256: e940eaf44f6479a18444482fe30da6fe45f88c840668f6a37cd69f35c6798ace
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 significant number of embedded links pointing to various external sites, many of which are hosted on disposable domains or known redirectors. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=bald+mountain+moccasin In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f89a01c7abb7.pdfIn PDF document text
    • https://samirimirusa.weebly.com/uploads/1/3/0/8/130814124/sonilidijimebif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fc7d14778acd.pdfIn PDF document text
    • https://pegejapadeju.weebly.com/uploads/1/3/4/3/134355249/49bb03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_5fbd4fad52bc6.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/venemawuj-noxaropuneze-nabadebotisi-susetidor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5f977b7e5e395.pdfIn PDF document text
    • https://wowutelugige.weebly.com/uploads/1/3/4/3/134359508/dfe99d7f18bb531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f873d71ed802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5fb675cf2c855.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/zetare/satiku.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/potatog.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/11339416901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e688be-997f-49e4-8bc8-8a2dacc74f4d/pobijazebalopurexazoj.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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 5040 bytes
SHA-256: 32d69572b984c1f40e62e68f883711bd1b2d4847752470bfa9b2c3199ec1638b
font_01_sfnt_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 10936 bytes
SHA-256: a41816b04406b5f9e6575553b4e5ccca90038e75ee889ed252ff06653d9a3d04

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