Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e856720e9913556…

MALICIOUS

PDF

70.5 KB Created: 2020-12-22 14:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 25825dd880d871d9bfb4708f983ad020 SHA-1: ad48a1cf1f3b37e0f7edf79bc7aa420bde62dc8a SHA-256: 2e856720e991355608b3d1b80ebb48d5d6ba0d9585f1896e613a97352508a637
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these URLs are part of a link farm hosted on disposable domains, likely to obscure the true destination or spread malicious content. The presence of embedded URLs and the overall detection suggest a phishing or malware distribution attempt.

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://traffking.ru/strik?utm_term=apple+store+fun+race+3d PDF link annotation
    • https://zuzunavodezap.weebly.com/uploads/1/3/0/7/130776081/nozepakopuxiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_5fb31c12cfb2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5fd9447b1620e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f875d895c080.pdfIn PDF document text
    • https://jakigirizog.weebly.com/uploads/1/3/1/4/131453624/wotako.pdfIn PDF document text
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/rimikirakesimonebut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fdd7ef764f69.pdfIn PDF document text
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/futuden.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc15629df132613bbc0c61d/t/5fcdc9799aa2de0c64b443da/1607321980372/xewug.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/half_life_and_radioactive_dating_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/memisitasezemuxifabame.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea1fa8793968640865e0/t/5fcf3f8b57846c5b83523e9e/1607417740022/love_hacks_for_couples.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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 5300 bytes
SHA-256: aec35511a9a04b0f26a3d7660d0b0fd2caf6180c4b1bf2c9420ee89c6f8dd1e3
font_01_sfnt_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 11048 bytes
SHA-256: 8264377d906e5c52e584e55d0f1bb989d493895225b45192cc42b427bcc4ec07

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