Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f667e48537d4bf…

MALICIOUS

PDF

81.8 KB Created: 2021-05-13 06:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4651f652877f54b51d1bb43e4b48f3b7 SHA-1: 28cae113e7550de0e06f991994abee93c06d749f SHA-256: 38f667e48537d4bf067979cda3a01c24173ea7a210cd1382812bf281ef268d80
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or to distribute malicious content. The primary external URL observed is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://xezojetit.ru/strik?utm_term=how+to+get+child+lock+off+lg+inverter+direct+drive+washing+machine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5fffdc459d3bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_602fddf2db996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5ff6bee90997b.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/tokyo_ghoul_re_manga_anime_differences.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5ff8a25a134f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_602bfbb584d5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_604cb37091eb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491705/normal_5fe188b8ec01a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_605678f1b9c02.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/ncert_exemplar_class_12_maths.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fe63b5a859b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455884/normal_603f36159fda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fdc192f07af4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_bfdc376d648d49f49597823736400f72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/068dbb37-b8be-4efa-ad44-d8aae901d086/2019_subaru_forester_2.5i_premium_awd_review.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_cbe24becc1124867b900b72b9f3ea5ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb194b09-792f-4b59-a011-e6785279847d/minegivezuzevajabej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4238a281-5d6d-454d-85bb-0885507fe244/zewiwofomajugikus.pdfIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_800e91fbc3fd405e9f772be8be442e02.pdf?index=trueIn PDF document text
    • http://jefiferinazubim.atwebpages.com/cessna_150f_poh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47db252-71cc-4a84-b3ed-fd2843c8aa0b/medieval_2_total_war_mods_mod.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_a0525903c3524359934466d23dc1d8cd.pdf?index=trueIn PDF document text
    • https://854397d5-242e-4836-9f1e-4d22a5541959.filesusr.com/ugd/88a329_fba8f1201cad4e7fba43d60fa8c933a5.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_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 5612 bytes
SHA-256: f3fb20aaaaa2385c2cd59017cbf7274eb268a54e72873f95401e3ef740cdce1e
font_01_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 11324 bytes
SHA-256: 694c68178a1419daba94339dcacfc2a3baa036816c69d71c9b0cca9c92322d25