Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50e6f39f00a71f7…

MALICIOUS

PDF

83.1 KB Created: 2021-03-20 23:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 593b28756f2f7f53ca6c6aa693916f6b SHA-1: 1fb440c3b36e0ac1a662daf5bede258de755099a SHA-256: c50e6f39f00a71f7ca00fb3dcca72a53370d3425f21650bedc0be4d0ea1eb583
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=world+mythology+the+illustrated+guide+roy+willis+pdf PDF link annotation
    • https://lobumemimakagom.weebly.com/uploads/1/3/3/9/133999871/zaxadakiv-vopuludejuwuna.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/4ea2593d1996.pdfIn PDF document text
    • https://jolezage.weebly.com/uploads/1/3/4/3/134336692/8edfd5ed5383.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/najikaponezane.pdfIn PDF document text
    • https://bimeriwuju.weebly.com/uploads/1/3/4/9/134901074/negipovuvo.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/4532564.pdfIn PDF document text
    • https://cdn.sqhk.co/sifilefu/hAibPgf/expanse_season_5_cas_anvar.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/gdiihha/street_racing_3d_mod_apk_6._0._30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_8cc9d8355b334121a0983cfada6d1ff9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff3eebe-f7d2-4ea6-9c82-d6f5b1f547b4/6350959283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbb5979-5542-4f33-8183-88f1ae288b23/from_a_passage_to_africa.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_d0a7d659d3d2468c8508ca79d0d3a6a9.pdf?index=trueIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_636b5144727c4b9499184b9e69f3afbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b84b1c6-15d6-4179-9f3b-4b0e52c5bf1f/15541034474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea2901c-f97c-44cd-926f-3a4398d61b37/70571566662.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/febapuxuziro.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/sunshine_in_my_pocket_lyrics_and_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42cc251f-e947-4840-a9ef-25f5ff7001b7/fefagasitaz.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/48828987331.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/11076888050.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_2c960baf7ced4dac9b412745df818195.pdf?index=trueIn 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_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 5664 bytes
SHA-256: 4f39aeca1178ca8f7c65d40d48b9359e7fedfd4c184102d43b5653df09cf797b
font_01_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 11396 bytes
SHA-256: adec6031fbb5a39b6511689b087bbeef998688b654beca3d7825f23e05e8895a