Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbdb151772843e8…

MALICIOUS

PDF

71.2 KB Created: 2021-01-28 00:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f95f6fd20d933d33a920d011ddda5b2 SHA-1: 8a5dea0877833ca8479b9d54ccc611212e555cbe SHA-256: 4cbdb151772843e831353932abcd7c74ed262a807c363625512a3fd70b3e65e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/aws?utm_term=construction+cash+flow+template+free PDF link annotation
    • http://allrecipes.pro/likotumaso2qk35.pdfIn PDF document text
    • http://madamzero.com/core_elms_student_loginrpn3k.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/8508164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_5fd17ee93210c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_5fd0e9d380670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5fce86eb565b1.pdfIn PDF document text
    • http://gradstroy.su/800383222403ll9l.pdfIn PDF document text
    • https://dagazafija.weebly.com/uploads/1/3/1/4/131484603/79b784e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5fc64a1fba894.pdfIn PDF document text
    • http://4338bacchus.com/super_soccer_champs_2018_apk_download5o3k9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_5fdb195fa7f67.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/wagifajananonanofaf.pdfIn PDF document text
    • http://fishing-rods2.club/playgo_gourmet_kitchen_appliances_toyioblj.pdfIn PDF document text
    • http://levantemosaic.com/sample_termination_letterfpn3w.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxolusufa/bghAhcz/jirefapanewada.pdfIn PDF document text
    • http://copyrightshelpcenter.com/51953049482sqqa5.pdfIn PDF document text
    • http://drawer.icu/kirimajowis41hcy.pdfIn PDF document text
    • http://idealica-tufficiale.website/the_penguin_fish_bar_tivertonen6e6.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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 5252 bytes
SHA-256: 287ba25b886d020064b20bd9469831e7cab4461ef90767e444fc9e2619f74381
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10576 bytes
SHA-256: aea3a8f525b1379a72adb60eac0b41dcf8b58c76aee45f0744d87288b1550f08

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