Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdce2adafe9e27b…

MALICIOUS

PDF

75.0 KB Created: 2021-02-15 05:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e52851d811efa8e83fe7d7e5a0a02f64 SHA-1: 4ef5b221864af2635e1c423bbfff593b8431432a SHA-256: efdce2adafe9e27b7a5c3ec8562ef58d8c62c9f5431e76dcf4e498385b185bc2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the nature of the embedded links suggest the document is designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=dr+debra+soh+book PDF link annotation
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/lewusa.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/jZjjajg/wifi_driver_download_for_hp_laptop_windows_7.pdfIn PDF document text
    • http://xsale.trade/motesurofasnmqdp.pdfIn PDF document text
    • http://trikotoria.ru/add_text_to_files_onlinec5cv7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419645/normal_5fe126fe48f81.pdfIn PDF document text
    • http://com-connexion.xyz/transformer_bolted_fault_currentymtlq.pdfIn PDF document text
    • http://agentsoft.space/nuluzopobazi0emd0.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/muxojepofizobesafoz.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/9184935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_5fd64e7074f86.pdfIn PDF document text
    • https://wujumumokujot.weebly.com/uploads/1/3/4/6/134613036/jedari.pdfIn PDF document text
    • http://rodsfish.club/931291970915j2tl.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/nicjdDq/ping_pong_table_walmart_espn.pdfIn PDF document text
    • http://tortomsk.ru/3152328589u5erk.pdfIn PDF document text
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/sosojixepal-jisufuzo.pdfIn PDF document text
    • http://instup.xyz/justice_league_vs_teen_titans_download7ct5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 5084 bytes
SHA-256: 9ba769eb754ba5909b0a29612200834c04caf7cf02141860d5407cefc8590bd5
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 10616 bytes
SHA-256: 7069a96dcac7a4f29aaad398ec7d179b7caf80ae09814d1cd07044fb50b8c3f1

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