Malicious PDF — malware analysis report

Static analysis result for SHA-256 863f36f2ad84247f…

MALICIOUS

PDF

82.0 KB Created: 2021-03-10 08:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2b13e340cd73a177fe185fa2e6fafc1a SHA-1: df39f1fa4a13b9011e6a1330037c5af1ab6bbfac SHA-256: 863f36f2ad84247fa2de3c6cf8bf37aa1326f4981f6171e3bf77b804fb908fb0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. 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 numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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=drum+fill+patterns+midi PDF link annotation
    • https://cdn.sqhk.co/farafakilof/jjOrigg/realm_grinder_r16_research_guide.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/555009.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/jztyUhh/71319034841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_601d5b99676e6.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/fghgije/doom_patrol_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/gnrIkgg/24603146119.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/9iejgW6/cake_decoration_with_flowers_and_fruits.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/mesewiratubet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_60199e1bac8f3.pdfIn PDF document text
    • https://cdn.sqhk.co/gutipefu/2iezONg/allegiant_stadium_seating_capacity.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5fc9776b373e6.pdfIn PDF document text
    • https://xajekedifa.weebly.com/uploads/1/3/4/4/134469171/ea97ed7e4.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/uCgccvB/color_jumpsuit_shorts.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/fjiiggj/shelter_island_restaurants_long_island.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369308/normal_5fe4786d9eec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5ffa35998d75f.pdfIn PDF document text
    • https://masagefila.weebly.com/uploads/1/3/4/5/134505888/xefuzuniwi.pdfIn PDF document text
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/7980048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/310d04ed-b750-43e0-b40e-76b9329b299e/speed_queen_washer_disassembly.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/class_10_maths_book_cbse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbc3849-817f-4b27-aac7-321122a387be/kowakenudisalal.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/70271853067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7400633-3594-4240-b8c8-457138c6beac/what_is_ring_size_for_cigars.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/bomber_friends_game_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843ecc50-218a-4493-a486-ef7e0f980d9d/mujolavivujudavuzuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08f4e70-e31a-44e0-81d3-f885fdadaa13/xoxovopox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 4960 bytes
SHA-256: ada0f7d30283b33604b74c4f96665c366e68ad890d177cdf076bd43b930989e0
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 10736 bytes
SHA-256: 22ea11b9feb49f24a1ab8670340c84f069e011a60862f69351f8bd3d738bc70d
font_02_sfnt_off00012bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34