Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe62d4667d334f3…

MALICIOUS

PDF

78.3 KB Created: 2021-05-29 16:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a0b04003caeea712742edec4886bf5f3 SHA-1: e5c2bfa4c61a1a5c69f271a208f8d3189cdb0b9c SHA-256: dbe62d4667d334f37c774b5043cf30b30a6b40328de0e326e2b767d89e5cccc1
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=advanced+mathematics+precalculus+with+discrete+mathematics+and+data+analysis+teacher%2527s+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5fde6126e240f.pdfIn PDF document text
    • https://wemavejuza.weebly.com/uploads/1/3/4/6/134689468/loxuxisaxama_benazavizumigix_jagaporimudovo_guzaxisisu.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/widazapevakekupof.pdfIn PDF document text
    • https://lotekine.weebly.com/uploads/1/3/1/3/131381428/7263694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460232/normal_5fe3c74b5aa5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_6009ff4fb525c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_601d11ba55a3e.pdfIn PDF document text
    • https://melejorun.weebly.com/uploads/1/3/0/7/130775242/5095439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_5ff21b5f312ca.pdfIn PDF document text
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/3830632.pdfIn PDF document text
    • https://xuxixoxeniti.weebly.com/uploads/1/3/4/5/134585484/a9e8e.pdfIn PDF document text
    • https://regasefes.weebly.com/uploads/1/3/1/8/131871592/5369982.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/3b3088ba-116e-47b2-a669-3f6b844c4016/25763768283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7078ffd2-288e-4fca-a921-8a807ea0c8dd/what_instrument_is_used_to_measure_room_temperature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ddde08d-96f3-4dc1-a310-0ddac56c2924/xereludujugawifusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fad11bb-12ed-4258-9551-93e6982183f3/79267395047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aece692-4b31-42b5-9c4d-f0a7f206669f/what_is_dog_man_and_cat_kid_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fd1a93-8146-43c1-be5b-890ca0ec070b/savaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bafa610-c63c-4a77-9b02-a66e7a7683fb/peugeot_103_sport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665c1d01-e48e-49c0-a057-60ef8b057c38/kenmore_he2_washer_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e08429-5128-48b8-9fad-d21079b7f052/how_to_tell_if_someone_has_schizoid_personality_disorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb17454-161b-4582-b3a2-af2d8375e716/canon_powershot_a520_maximum_sd_card.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_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 5672 bytes
SHA-256: df588c4d177d4d0ceb6901e8bc426fabef3090f9a08ff9e8b093b88721b7a248
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 10892 bytes
SHA-256: 95ca0cf5873d50100da4b8db52b27e27bedafe787e3b6561d08e9be83d4cefce