Malicious PDF — malware analysis report

Static analysis result for SHA-256 630316c39846bc4e…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 13:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 785550453eb83fea8f49717d926222c5 SHA-1: 85ee13cfde8db75be4c51a4168208f9d6bc06257 SHA-256: 630316c39846bc4edb5e8818030cbc8c72ffbc428c225aa4a1008f445d708ccf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to direct users to potentially malicious content or for SEO manipulation. The presence of a link to 'jacksth.ru' with a 'skill saw guide' term suggests a possible lure.

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://jacksth.ru/123?utm_term=skill+saw+guide+canadian+tire PDF link annotation
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/4386031.pdfIn PDF document text
    • https://gogozofoful.weebly.com/uploads/1/3/4/5/134512065/1025933.pdfIn PDF document text
    • https://cdn.sqhk.co/vavefamixivi/a8dgeia/tutijed.pdfIn PDF document text
    • https://cdn.sqhk.co/fidinananale/hheWhba/fox_sports_go_roku_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402014/normal_5fcd79de8bca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_601acced40a64.pdfIn PDF document text
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/foxeje_wateloret_buxilib_bojomejosop.pdfIn PDF document text
    • https://cdn.sqhk.co/vebudirepo/gctJP6l/6704354328.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/LigyghE/conduct_this_train_action_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/iPhaoTv/xugebij.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/ujehegf/mifulunoroz.pdfIn PDF document text
    • https://cdn.sqhk.co/komukopa/l7rij6m/brazil_simulator_2_premium_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fexefurif/eiehgja/chutti_song_hd_video.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/lixejejekurefigit.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/gfimXEa/youth_basketball_training_equipment_dribbling.pdfIn PDF document text
    • https://semirenuzunep.weebly.com/uploads/1/3/5/3/135325284/1753056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_602a989a16069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_600e96967d4f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/translate_english_to_portuguese.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/carotenoids_are_a_precursor_form_of.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/losej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c95358-8f4e-439f-81cd-8b4654c84289/tajotusafavosanowibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ccedf5-be06-4522-b0cc-bbc1827b7ded/wemanilubudogogaragoguli.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_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 5364 bytes
SHA-256: 442f646c7a558a9816a9a6f4308029fbccde5d3d1d5e71d0deeaada899e499b3
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 11976 bytes
SHA-256: 0cda7f7ea60a4ea6e162c08530c1b6d33320c6283f32e3c8946971d35cfef34d