Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3dc48215467f4a…

MALICIOUS

PDF

82.3 KB Created: 2021-05-08 21:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7d04becdbefaea6049f78f1d4f327e48 SHA-1: 39cd8b4f8a67fe3cce4d8f0fa1291796045e5c31 SHA-256: 8c3dc48215467f4adbf2192666c75708dc8defebe6c8470a96eecdf94fe8f125
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, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and trojan activity. Although no scripts were explicitly extracted, the presence of numerous URLs and the heuristic findings point towards the document's primary function being to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=what+are+the+bible+verses+for+healing PDF link annotation
    • http://esparks.ru/bohemian_rhapsody_piano_sheet_robloxbese0.pdfIn PDF document text
    • http://wexypay.icu/salewejoxirupitewonumeop5vg.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/Khg9tp2/adventure_escape_time_library_chapter_2.pdfIn PDF document text
    • https://majuxakitififez.weebly.com/uploads/1/3/0/7/130738909/ee19f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375207/normal_5fca35ac96ca5.pdfIn PDF document text
    • http://hs-life.ru/icse_class_6_english_literature_book_free_downloadec92u.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/42b05eaf.pdfIn PDF document text
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/fujawuna_niredalowe_kufudapobugi_rajirawexamerin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_600c8b8e04a8f.pdfIn PDF document text
    • http://habercigo.com/game_theory_textbooks11ef.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/0b52babd5a11.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/ahfymTF/13366900673.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/c8c7e328fc7.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/mxQjQij/45008452492.pdfIn PDF document text
    • http://arendaavto.taxi/impact_of_globalization_in_tanzaniaxaanv.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/eOgf7jb/sezopuwuv.pdfIn PDF document text
    • https://mudasolujo.weebly.com/uploads/1/3/4/8/134886274/2746001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60287c2384c83.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/856ef5d1a7f2.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/4438236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ff65541984a6.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/lomuper/indian_vegetarian_gm_diet_plan_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/48585352035.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_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 5240 bytes
SHA-256: 510af1c4854dcb3315de65b348b840132d552f5423a0dc53a7077c71149ef381
font_01_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 10924 bytes
SHA-256: 4ce20977e3b238f38c0f0af59b595550a560a1a0ccaab80b17663ae5c07d7e84