Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f40e54cee0c8b11…

MALICIOUS

PDF

74.4 KB Created: 2021-03-29 06:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3898ad52d938e09a76165fc4472465bc SHA-1: d7d6f10b489922de9028a8491bdfc8feb5c35b77 SHA-256: 8f40e54cee0c8b1182cc910953bc4d70f00d127c01a34aedb9ad0b1e63ce2f05
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a link farm on disposable hosting, pointing towards phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=d%2526d+online+game+steam PDF link annotation
    • https://bemijeze.weebly.com/uploads/1/3/5/3/135302335/b76a8ec751.pdfIn PDF document text
    • http://laulu-go.ru/201861102688msjb.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jjQ18ii/39029863560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_605ffedf1a16d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_600a4beb87b17.pdfIn PDF document text
    • http://everydays.space/mefoxikelj2q5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_604d6ed55ccce.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/3ac681f.pdfIn PDF document text
    • http://brumbum2.xyz/hitman_blood_money_mods00idf.pdfIn PDF document text
    • http://gsmall.space/15298774967y3yp9.pdfIn PDF document text
    • http://leopolds.space/pharmacology_a_nursing_process_approach_7th_editionlkhis.pdfIn PDF document text
    • https://cdn.sqhk.co/jugokake/Ishfgdm/titan_quest_xbox_one_ragnarok_update.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5fe60b5948553.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/ijhbhhV/police_car_siren_sound_effect_uk.pdfIn PDF document text
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/3521194.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/f6338726.pdfIn PDF document text
    • http://arboozfilm.com/factotum_3._5_handbookzd2y6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_601717970eca9.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/jgxXegh/wirewarirazoguf.pdfIn PDF document text
    • https://cdn.sqhk.co/tevenijubuso/V88giim/bitifuridikogos.pdfIn PDF document text
    • https://widoripitobagat.weebly.com/uploads/1/3/4/8/134882637/lerun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_da953f2d150648e5896b321d5c3957b6.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_abe9544621694426bff07f232f5fde6d.pdf?index=trueIn 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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 4156 bytes
SHA-256: 5ae3bcc49c87f96444fbe3d11ff27db43b6aea299416b9f3d286273c64098da8
font_01_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 10612 bytes
SHA-256: f3a25bda3635df85fe2cbd0fd88647c45561dde2285d8effba354f8492ecc800

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