Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da07741bbc9fa6a…

MALICIOUS

PDF

83.0 KB Created: 2021-04-17 20:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6a78a9a2c56caf964575d6a57e7f1d0d SHA-1: d2dc350f41f40acbbf230cd619ca673fa7e78497 SHA-256: 8da07741bbc9fa6a9528f956bd00a7fe31a6b290aea20fe11d5921579e676c1d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. 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 URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=arduino+mega+pins PDF link annotation
    • https://cdn.sqhk.co/jesovolavig/hdhhjgQ/banana_blast_game_video.pdfIn PDF document text
    • https://pezomivagijo.weebly.com/uploads/1/3/5/3/135392772/mufavudegupan_zujoliroxaboli_zumurowanaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_6034f44d8bb1a.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/e2a19a00cf9e5a5.pdfIn PDF document text
    • https://cdn.sqhk.co/lezagononek/cDazhd2/brunelleschi_formazione_artistica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_603a0fe4f0e6f.pdfIn PDF document text
    • https://zumonula.weebly.com/uploads/1/3/5/3/135323502/93fe3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_5fd19d6594025.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/bQzcxAW/u23_world_championships_rowing_2019_live_stream.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_6058088297498.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486054/normal_5fe56d46d38f6.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/cb61e5028.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/681b0297-7f5b-4584-90ee-fa9363dab483/past_simple_present_perfect_exercises_macmillan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d93b22e-d391-4976-a15f-118498c355f3/dnd_5e_classes_wikidot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e89929e-9244-4881-aa7a-0915e4d21b81/gramatica_basica_del_estudiante_espanol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93a353e-5980-4179-863a-de063e330d71/85381279810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af94b98-1b76-43f8-af6a-93a014b96e61/vtech_ds6671-3_canada.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_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 5236 bytes
SHA-256: 746f1f1c8f6f5ad15eba5fa6a8ff5d5d3d87af1a22c3db4b63463e6ae422508b
font_01_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 10940 bytes
SHA-256: 175675bff3ee8e445b091bbf193dda47d1973ec6943e6cbdf5b76d0c6db6dfb2

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