Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e44a86cccbeafc…

MALICIOUS

PDF

73.3 KB Created: 2021-02-25 10:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 661bc5d5cec017fa48f5b2de23143aa6 SHA-1: 39dd58a3a6283d93d2a1fe7c7bbb91a3bc23c892 SHA-256: f4e44a86cccbeafc21bf66f849d4c96cbe6b8a0dddb56e795db1373c0d660db4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content, potentially for phishing or malware distribution.

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
  • 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/aws?utm_term=logitech+k400+plus+wireless+keyboard+review PDF link annotation
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/bemavuxov.pdfIn PDF document text
    • https://kovuvewu.weebly.com/uploads/1/3/2/6/132695697/puwixikimofokomiso.pdfIn PDF document text
    • https://fiwudarive.weebly.com/uploads/1/3/0/7/130775392/9511333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_6023f06864129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_6016ab214518a.pdfIn PDF document text
    • https://lupemofuxuxutuj.weebly.com/uploads/1/3/1/3/131383332/livopegab-lagazizipi-rabibanot-bapere.pdfIn PDF document text
    • https://vulelarebu.weebly.com/uploads/1/3/4/9/134900748/303751.pdfIn PDF document text
    • https://nuvefozilif.weebly.com/uploads/1/3/4/7/134733792/jujefafasus_gidug_narixig.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/1997d7f7.pdfIn PDF document text
    • http://gezuvimazog.22web.org/bionaire_bap1700_air_purifier_manual.pdfIn PDF document text
    • http://pufufabimego.iblogger.org/acls_protocol_cheat_sheet.pdfIn PDF document text
    • https://vonefemupeme.weebly.com/uploads/1/3/5/9/135957005/kajijijuwadej_tupuvud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomapagovujux.atwebpages.com/20042568990.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/best_smart_board_for_classroom_in_india.pdfIn PDF document text
    • http://jugoribomepi.rf.gd/8262769513.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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 5964 bytes
SHA-256: 39452c3e6eb86675524b1554814e438f8de2f2d2d5a4023919483acf03dba8f5
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 10696 bytes
SHA-256: c70d8b44a41f9774c474d832c99826d267847485fbea11d07601342913693a7e

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