Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd3ca1dccdea436…

MALICIOUS

PDF

83.0 KB Created: 2021-05-26 06:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7296263b5221d33670659aec4f9aba5c SHA-1: d40787dff7e7d7317372f113e84d249b69c45370 SHA-256: 9bd3ca1dccdea436602d81fda9e14fb7959e71a644c7fa1bcd938f20d9090c74
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'gimoguvi.ru'. 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 links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=medical+emergency+drill+report+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369189/normal_604d011c46bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_5fd611ede2ade.pdfIn PDF document text
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/7624519.pdfIn PDF document text
    • https://xufujume.weebly.com/uploads/1/3/4/8/134851049/kadunuwifijejojib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490917/normal_60057a43d3cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458635/normal_6058bf89e908e.pdfIn PDF document text
    • https://finibolamojirum.weebly.com/uploads/1/3/5/3/135341575/9866771.pdfIn PDF document text
    • https://wigulasekejum.weebly.com/uploads/1/3/4/4/134492960/9759039.pdfIn PDF document text
    • https://xunuvetokogira.weebly.com/uploads/1/3/1/3/131384336/1261623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5fed802a71575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6056a6e579543.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/d9349d7f-6b47-4b01-8416-622da694cef0/panasonic_kx-tg7875s_cordless_phone_bluetooth_link2cell.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/zijaniwupovudukapureke.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/pool_billiards_apk_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280abf5e-acba-42ed-b502-c60879931cc8/john_deere_high_lift_bagger_mower_blades_42-inch_cut.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/mivanumotulaferimoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e14a2e-64eb-4355-8bd9-82be3047435a/vetulaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def9c32a-7f9c-466e-a642-2e6b5d98b881/kevin_reilly_worlds_of_history_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5053c72-b247-487b-9d9e-8a8d06d4420d/vigoxolabolebabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40848a02-87d2-465b-ac98-f4f5352d3646/honda_gx620_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b74341-0554-41d2-9b55-829873ab9e1c/43554841269.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/call_of_duty_mobile_zombie_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17f9ec8-329b-4140-abee-63d3a32407fb/directv_genie_2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b71f82-c676-4ec2-9d24-1358bd959e66/valisen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e8c0cb-7cf8-47a8-90be-50a003298af8/the_painted_bird_full_movie_watch_online.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_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 5500 bytes
SHA-256: 0aef56bcfa8bab676bff711b03eec602b0b472e400a2c4ae1233cb1808180d3f
font_01_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 10496 bytes
SHA-256: ba40edabd76c56a453b571a8f7eecc1c7b2dc854ee4140c509cccc8abf5493ce

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