Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be5d83a2306cbf7…

MALICIOUS

PDF

79.3 KB Created: 2021-05-16 14:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a0ba7b7cd16f595925172fa108745b1a SHA-1: d46a2e9b932ca52b07f0c49523cc21742118753f SHA-256: 6be5d83a2306cbf7fd2b7562271fabea2d0c1ba8dc332b93f8eab6af92f2dad0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=how+to+add+fonts+to+wix+website PDF link annotation
    • https://wisukasef.weebly.com/uploads/1/3/1/4/131453855/7760525.pdfIn PDF document text
    • https://cdn.sqhk.co/kasunelebak/tzKgfhg/40307264112.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/acRibhg/4621733512.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/PrjcUje/cake_recipe_without_eggs_and_vanilla_essence.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/tedurigur.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/7226689.pdfIn PDF document text
    • https://bedapidipofawif.weebly.com/uploads/1/3/2/7/132711979/jarob_zirunut.pdfIn PDF document text
    • https://kenibuxe.weebly.com/uploads/1/3/4/6/134688639/xegugudofitotekebix.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/2PheHZ0/escape_the_lab_re2_remake.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/9708521.pdfIn PDF document text
    • https://cdn.sqhk.co/noligigibar/YDIjdU9/direct_speech_worksheets_for_grade_7.pdfIn PDF document text
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/e39ac861a47.pdfIn PDF document text
    • https://befugusugub.weebly.com/uploads/1/3/2/6/132683140/godogoz.pdfIn PDF document text
    • https://gutirupivib.weebly.com/uploads/1/3/4/7/134768574/112927d4b6.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/a83c3f00-0328-4c7c-b046-7036af7c78f1/4978949277.pdfIn PDF document text
    • http://nolerepegumadoz.epizy.com/97925187446.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/cuadro_medico_asisa_madrid_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a0728d-f43d-46eb-a20f-2021b24b0ddc/96587339537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7853647-f94d-4a1e-8c55-da6353ddf581/how_to_use_blast_furnaces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7069b2d-20bb-4a22-8e59-2d85293c309e/taco_bell_fresco_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b7fd7c-f6eb-45e3-99ff-c7ef578ff46a/kafovimo.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_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 5032 bytes
SHA-256: 9fdbc6a38ca5895a258e4539aeae159a7525d251c15c1dd4f392d18ae151a937
font_01_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 12032 bytes
SHA-256: 4c24e605fea2bf21d753ddf2bb83304d620a4b090e88224bb6235ecf55146de0