Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6d445b1a4e88eb…

MALICIOUS

PDF

110.8 KB Created: 2021-02-27 03:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9ae9027627ce2ffc1e477501d06e34ac SHA-1: 29894ccd8c3494848a9e6626c4775cc1146e679c SHA-256: 1a6d445b1a4e88ebbeb7151bde48cb747e6067ef5d630b94cc05d253f0e82eb0
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of external links, many hosted on disposable domains, indicating a potential link farm or phishing attempt. The presence of embedded URLs and the overall structure suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=aeschylus+the+oresteia+pdf In PDF document text
    • https://rojukekodeb.weebly.com/uploads/1/3/4/6/134682316/kidobidedofoted.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/dewogupodon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fe9298cb6fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5fd2e05af02f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_600dc5300f777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_6027075256bff.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/113f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_6011c69007d59.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/koteluxin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5ff005fdd445a.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/sat_subject_test_dates_2018-19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://liroporuki.myartsonline.com/is_it_hard_to_pledge_delta_sigma_theta.pdfIn PDF document text
    • http://paxubar.rf.gd/duxofunuludofarobesoj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15093 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off00015b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B16 5112 bytes
SHA-256: 69d84cce7b8436081ed8918676755cb749273a75ffff2c60a1bc0ff338afd484
font_02_sfnt_off00016c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C93 16552 bytes
SHA-256: eba96d5cb2d3576d8d50d9f9c7d1d52649a9f91b9cdcae5272daaf09ea46d483
font_03_sfnt_off00019f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F97 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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