Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95c1c3399e3f88e…

MALICIOUS

PDF

75.6 KB Created: 2021-04-29 13:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fd6fdd3a30ca5a39ad3800451809f73e SHA-1: e9e74aea4e77fa402b2d17f9469e0e08bf3bd99a SHA-256: c95c1c3399e3f88e0a7b62caf4af397e2ea34354092248433a3cdd0e54bf1e59
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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/strik?utm_term=accu+chek+compact+plus+discontinued PDF link annotation
    • https://kutijodokijo.weebly.com/uploads/1/3/4/7/134706590/a7087.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/resirekizozimadetu.pdfIn PDF document text
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/bfb2ae8db82.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/33095289875.pdfIn PDF document text
    • https://xogukozatakik.weebly.com/uploads/1/3/1/4/131453421/zikuwekimon.pdfIn PDF document text
    • http://gutibefatidag.medianewsonline.com/19450956217.pdfIn PDF document text
    • https://kanefudejezem.weebly.com/uploads/1/3/6/0/136056225/9d59a3c85733.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/litododif.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
    • http://pulitisagot.atwebpages.com/71070837324.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/how_to_heal_chigger_bites_on_dogs.pdfIn PDF document text
    • http://nobufep.epizy.com/bushido_blade_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/65176577197.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/atwood_marine_hot_water_heater_manual.pdfIn PDF document text
    • http://romepasuv.myartsonline.com/sududogoburavisof.pdfIn PDF document text
    • http://vodetajedeluz.epizy.com/alopecia_androgenica_masculina.pdfIn PDF document text
    • http://vigogogakuza.epizy.com/saxuresisepirodo.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/day_of_dead_mask_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/unity_asset_store_2d_shapes.pdfIn PDF document text
    • http://tibamupebunod.atwebpages.com/85093765081.pdfIn PDF document text
    • http://kasisexa.rf.gd/oscar_peterson_little_jazz_exercise.pdfIn PDF document text
    • http://roveramo.atwebpages.com/renaparebevopo.pdfIn PDF document text
    • http://vasinazovuxe.rf.gd/bullet_raja_tamil_movie_tamilrockers.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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 5152 bytes
SHA-256: 3552085788aacc274291fc5be56b84069625f0df2466def2600c1b2eb225b13e
font_01_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 13144 bytes
SHA-256: d1b9dc52ef56f740a6623a9be7966b71348fdc7cbdb56835dbf5556173f55f76
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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