Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b348fe5d7cf073…

MALICIOUS

PDF

78.3 KB Created: 2021-03-15 22:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7abdcdfd75da93eb35cfa7775e1ad468 SHA-1: dcc02ec1a585ac5b512423db2c4f94e564ea8bf4 SHA-256: f6b348fe5d7cf0734dc33494f891d892c4608c84f030d4527d0d6a1707e8171a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, likely intended to redirect users to malicious websites or for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://lozipotod.ru/strik?utm_term=how+fast+is+ac1200+wifi PDF link annotation
    • https://libesomed.weebly.com/uploads/1/3/4/9/134904451/kajoju.pdfIn PDF document text
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/fba0e44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5ff698e2f3582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_604b551acdb44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457868/normal_5ff7fe9ba6a88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_603212883c8a1.pdfIn PDF document text
    • https://zoximubovug.weebly.com/uploads/1/3/1/3/131379564/madizixoxija.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/69061fb.pdfIn PDF document text
    • http://gdztut.com/nefawizedant31qx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_602a8e163ef88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488139/normal_6000a4d37dce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_602dfd80b6327.pdfIn PDF document text
    • https://lowobuganigazo.weebly.com/uploads/1/3/1/1/131163610/861ef1efd950df.pdfIn PDF document text
    • http://boxberry-24.cc/what_are_the_seven_main_types_of_internal_combustion_enginesrvunh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_602691007485e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fca5e92de58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_6042be20bc0cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_25242114ea07480bbd6ac15fad34cf85.pdf?index=trueIn PDF document text
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_6e90167d505c441984af49fd1490a283.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_84af944617d24530bf1cf6aac9278929.pdf?index=trueIn 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_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 5128 bytes
SHA-256: dc5bdb16c2496a87edf9fed52f79ba4922e1ed2d3308270a91a92cc8d8856fc6
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 10756 bytes
SHA-256: a20700ef5fdba76dace3809c986818247b34f9d06ded8a4d02c9e57cf0e20603

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