Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2028fb9b5c5223…

MALICIOUS

PDF

77.2 KB Created: 2021-05-14 03:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c46177c3227c66fdbfb9d7c431b28a19 SHA-1: dcb0717fb4d839e51dda745533b8a981182acabc SHA-256: ab2028fb9b5c52235a3f4c636e55b5a052432da0c994374c892a0a2fec0831be
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, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL 'https://seumenha.ru/strik?utm_term=elastic+band+resistance+training+elderly' suggests a lure to a phishing or scam website. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=elastic+band+resistance+training+elderly PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448547/normal_603f25dd9b030.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/ffUjbjd/pac_man_scratchers_commercial_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_606627873d52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_60464eb5b1d79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379851/normal_5fce52968b7a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_600bbb98e3ddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_5fd32d8cf1fd0.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/bargaining_power_of_buyers.pdfIn PDF document text
    • https://cdn.sqhk.co/biwizalibe/jhjahde/toy_story_alphabet_blocks_font.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/rational_functions_asymptotes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_6000bf43157c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_6066c58b42138.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_2d8451bd66d14735b83b665b98893374.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e19fa68-682a-4e81-8505-435f5e0a77ba/monsieur_ibrahim_and_the_flowers_of_the_koran_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae864d2-33b0-432f-b6ff-0d2b5f9e2ef5/what_is_the_history_of_immigration_in_the_united_states.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_6af885b23b6641e59795fa5ea9b2321c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3227347b-37bf-4ae2-83a6-54369d3d1c6e/uppababy_vista_v2_2020_stroller.pdfIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_6e614f5a0ecb49b4883e6be277d98d51.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_0839840ca4c345c190346c75a9788431.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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 5304 bytes
SHA-256: 7588e8537df58d51fc3be12c39f85e3e6d286f1c07276095f24bcb03260bb397
font_01_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 10680 bytes
SHA-256: 95f5ece86de60979f43628decf67035a8dab4c71aad4b8cdb569597cef5ec0b2