Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cb12a406c745c6…

MALICIOUS

PDF

78.0 KB Created: 2021-03-25 08:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f2b7a2a0a4d1555dee3716b1232510c6 SHA-1: c7f13954f86127973d7829f126964cfe196faf4d SHA-256: b6cb12a406c745c64ffcba07a8fc29a690e58dba43c41854262f5da075c34f49
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain 'baarspo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a malicious intent to redirect users to potentially harmful content.

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://baarspo.ru/123?utm_term=android+10+for+zenfone+max+pro+m1 PDF link annotation
    • http://redpandarecycling.com/tutorial_autocad_2021_macksdav.pdfIn PDF document text
    • http://meblik.su/51034711121lypnk.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/tjdhfu1/garou_mark_of_the_wolves_switch_review.pdfIn PDF document text
    • http://tryraisins.club/petezodi9ite.pdfIn PDF document text
    • http://power-guard.shop/ravaluwuvedesumd40h.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/gyijihN/nefinalisiredovezez.pdfIn PDF document text
    • http://prequester.online/how_to_unlock_lg_ac_remote5bn1k.pdfIn PDF document text
    • https://cdn.sqhk.co/zunegajudune/4ZjiRxB/financial_confidentiality_agreement_template.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/hjibhfb/64017369920.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/vintage_muscle_cars_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kevamubeminu/ihdcuy8/fantasy_general_2_hero_skills.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
    • https://uploads.strikinglycdn.com/files/0e77a5d2-32c2-4855-9c7e-f22d1ee54bd0/why_is_my_samsung_controller_flashing_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229a84c8-4c4a-44b6-8f91-d939e1ee2e48/49396622675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e1ab9e-e0c2-47b9-ad64-f19795ef4a5b/nazuwolugijerojutasep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733de214-7784-4a4b-84cb-d24aaa84c287/55435609755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94d9b4b-72cc-4d5f-b785-bc5c14f4f34f/8580774810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8714c2eb-f669-4e2c-96a1-556505ab1305/60354439399.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/jelafafifa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 4984 bytes
SHA-256: ec839b6222d180d8c31caeb79490d4fe31ff2ce0142775a27e6fcd40a03b3e7b
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 10708 bytes
SHA-256: aff13b0c069a24110b225b4f8a839b9d0c586dee2fa2012c0f15f6c334652980
font_02_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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