Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedcf29e6b5c3652…

MALICIOUS

PDF

67.6 KB Created: 2021-03-05 08:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 26b5f831fc959ca96032df0fdce9559a SHA-1: 415c307948a921c7238ac328ab3bc74577c1a954 SHA-256: dedcf29e6b5c36524dd8a5fde12682b2118a21ff42c1aedb5fe3b8d338dffaf6
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, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=design+of+concrete+structures+darwin PDF link annotation
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/jarofefosarofivev.pdfIn PDF document text
    • https://tuxaxigete.weebly.com/uploads/1/3/5/3/135324810/5678780.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/69884634211.pdfIn PDF document text
    • https://fodumalape.weebly.com/uploads/1/3/2/6/132695584/30b9dedbe.pdfIn PDF document text
    • https://ganizosu.weebly.com/uploads/1/3/4/4/134434359/kevomosa.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/volume_of_a_cylinder_worksheet_grade_8_answer_key.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/51321b82.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/c177d59ae0fc.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/jolebanarivife.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_083dc160239c4008bfc8c84dbeca7b35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15eedd8e-b3d7-4d1a-8a1c-093b07ec06cd/moon_over_buffalo_script.pdfIn PDF document text
    • http://solezod.myartsonline.com/24132751440.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/avatar_movie_telugu_movierulz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bbebfa8-fbc4-4855-8964-7c29993a74fb/55084810982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bb20c8-7e3b-4f93-b192-07f60edb117e/gedenivorafujug.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/facial_gel_sheet_mask.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_4d82eadad6ec41ef8900b8f1bce65f2e.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_d8c896b8463d45c18775c4a241abc02d.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_b08e4569f0524afe83d0355894cead86.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_08b4a43361f943caa2bc55de6008d627.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_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 5248 bytes
SHA-256: a517300124d047ffb331e3a860bc9c1bb09c4c26152808693bf1b446292c71f5
font_01_sfnt_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 10716 bytes
SHA-256: 8f07c3acbece7b757241f32d5ee6bacfbde621c35ba4df794b4bfe1c598a47af