Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6bcfa5d843c03d…

MALICIOUS

PDF

63.1 KB Created: 2021-02-20 08:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 15a8984beaceba75b5226b6825009a2b SHA-1: 0992d8042374b1b36e13e18e97f7dbd9702746af SHA-256: bc6bcfa5d843c03d845baccd7a9ff35f9e1f565013783517b86c2222b24c7848
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a likely SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

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
  • 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://baarspo.ru/strik?utm_term=dell+e207wfp+manual PDF link annotation
    • http://dithetsen.xyz/ionic_bonding_reactions_worksheet_answer_keympt6r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485318/normal_6008771cc1b20.pdfIn PDF document text
    • https://fadoxidibeja.weebly.com/uploads/1/3/2/6/132695582/botesolibige.pdfIn PDF document text
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/9d07a84a9a1682.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/c8d5a43bb.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/82906610777c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd648263c8b9.pdfIn PDF document text
    • http://idealslimitaly-official.site/jopaseloxuv2rto.pdfIn PDF document text
    • https://nefosedinipal.weebly.com/uploads/1/3/4/6/134698739/ee1547062ed107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365553/normal_60022691b4580.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/jemazejodep/79249962874.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/arjun_reddy_movie_background_music_naa.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/15913498800.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/umich_cse_course_guide.pdfIn PDF document text
    • http://bewebumaxof.epizy.com/free_bookmark_template_editable.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_off0000bcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF1 5216 bytes
SHA-256: f4ee07609d38d98c50472f5ff4c32c675d3695790b18998f241ecdce10a16ae3
font_01_sfnt_off0000cecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 9788 bytes
SHA-256: 6b18da49348420efdae846b59e79a93bde808fa992d522760ceb823f6db27706

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