Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad0bdafaca2fa05…

MALICIOUS

PDF

82.8 KB Created: 2021-04-06 13:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 70b25ab4febcfccc8bc83c0fd1c7fe6b SHA-1: ca6524102805f0b29d1fad279ce4b1ef735627f0 SHA-256: 4ad0bdafaca2fa058aa77f17ce2b861e2b8e04a1aadbeba0066b9b22727cd7eb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/123?utm_term=wireless+1000+annunciator+system+rc-+10u+manual PDF link annotation
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/62b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_600c4169e2da6.pdfIn PDF document text
    • http://vawefisalob.22web.org/komomokifutezowepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498842/normal_603049d75d2df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_602c1bb7c8d33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5ffab08ac07ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_6029cdd00dfc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_60374bc3adb15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_60206624d303b.pdfIn PDF document text
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/2581592.pdfIn PDF document text
    • https://gunisuzafi.weebly.com/uploads/1/3/4/3/134311694/171801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_600e458d7f527.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/2872984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_601ba91806911.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/0eea5915-9b3f-41e3-9e1b-207c8b25d313/who_is_stoeger_made_by.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f462cc5f-b28a-4466-b032-483f12f15a8a/how_tall_is_neil_degrasse_tyson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6e8b9e-c7d3-4587-aaea-3b2ea74428c0/84330594629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca7b1e5-30dc-4730-9f51-bae7b4e84b3d/nazoliwaferasuvidekomabuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529170f9-6152-467d-b5ad-8eb22b30c415/why_cant_my_laptop_connect_to_my_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772fce7b-dd21-4819-9b20-4aa5d57da128/exerpeutic_900xl_300_lbs._weight_capacity_recumbent.pdfIn PDF document text
    • http://nafopafilor.epizy.com/88533330475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3291546f-4db9-424f-b31f-2ed6b9a30d12/is_american_psycho_banned.pdfIn PDF document text
    • http://puxajominasunat.epizy.com/danuladexidiguziwuvazusod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61eee771-6943-4a45-bbd1-08dc4b2864fa/cost_of_rosetta_stone_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1deeedec-baa3-4ffd-9e20-0fe589b0d1f3/26858961061.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_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 5168 bytes
SHA-256: 9d4febe66dd1d6aed191f67e8a8e51f9e8eddd308712d1b1a09c6cdb25e434bd
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 10420 bytes
SHA-256: da30cc412487d166a9199a3a1f5a55908bdf8884b7d810e634b15d9d53d58a63
font_02_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176