Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ab606c3082246a…

MALICIOUS

PDF

73.4 KB Created: 2021-05-26 15:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b7878c31a61c034ed1400e8c12c2484e SHA-1: ea3628fb17fe9225e64081412bb48702133fa794 SHA-256: 64ab606c3082246a0cf4e83966222be306aec508a1ab0f7041279583d40612a7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a large 'link farm' with 30 external URLs, many hosted on disposable domains, strongly suggests a phishing or malware distribution scheme. The primary URL, 'https://mezovuduw.ru/strik?utm_term=timex+indiglo+watch+instructions+military+time', appears to be a lure, possibly related to fake instructions or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=timex+indiglo+watch+instructions+military+time PDF link annotation
    • https://jikonoligozeg.weebly.com/uploads/1/3/4/7/134755459/22032184d62.pdfIn PDF document text
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/zataxobi.pdfIn PDF document text
    • https://xijuwubime.weebly.com/uploads/1/3/4/2/134234920/037856db036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_6054bf28a2986.pdfIn PDF document text
    • https://pexaxodosusa.weebly.com/uploads/1/3/0/8/130874045/18ed002a0.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/baledivigilosafo.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/rodabunofa-binadev-mesilezi.pdfIn PDF document text
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/doxuxe.pdfIn PDF document text
    • https://rajajedoweji.weebly.com/uploads/1/3/4/3/134310645/rijefid.pdfIn PDF document text
    • https://kevifuzokidoku.weebly.com/uploads/1/3/5/3/135310888/fixigokatip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_60349c6fd91bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425533/normal_601a99b68fb3c.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/9823374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d987d7-0e73-4ec0-9458-a6ce0040be0b/eragon_movie_download_in_tamil_kuttymovies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebcc4a4-78a5-434d-9a4e-3f8893a7e56f/garmin_gns_430_simulator_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e483888-0e1e-43e6-accb-2a2dbbbfaf9b/kakibunalajutuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8c6463-d551-49bd-9a80-4e082f1f4e62/ti-nspire_cx_ii-t_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6b703e-30fd-46c8-ab02-2b1a68266a70/vitulezaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a01031-98a9-4d5b-8f59-01da2731b8ec/the_spectacular_now_trailer_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1495d0e2-552b-413a-91b4-e9ee3210e3a8/sharepoint_online_end_user_training.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 5564 bytes
SHA-256: 1f99849f45226f7d58fe4d57786a75d32647bfe735e0c91f1a9147bc4f2c5e80
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 10640 bytes
SHA-256: c202384a268f4ac2248382f410a4945188fe917f7d1432b0060d0d7d805ae954