Malicious PDF — malware analysis report

Static analysis result for SHA-256 891169b85b604c77…

MALICIOUS

PDF

64.8 KB Created: 2021-02-13 20:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: aed9dddc7c8ef34e1774d15596ca2ab1 SHA-1: f275749c699974a59bcc460ae9169cbb009aeed8 SHA-256: 891169b85b604c77a2570698d15960efe231326c8225ac1f7f3f412bc91d2b15
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content. The presence of embedded URLs and the nature of the link farm heuristics point towards a phishing or content distribution scheme.

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://jacksth.ru/aws?utm_term=arya+1+telugu+movie+free PDF link annotation
    • https://cdn.sqhk.co/lidupusumoj/jbNP6ij/50372109901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fdf300d159b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_6017679562071.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/04f941609.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/9570011.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/hjcFIMB/ifttt_or_zapier.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6019b9b92493c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479436/normal_5fed93a4925fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5ff01bc6bd697.pdfIn PDF document text
    • https://bupawajeba.weebly.com/uploads/1/3/5/9/135956748/lixowakepigoxuv.pdfIn PDF document text
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/repukidevoresin-vurexafagozivuz-jowiwevabib.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/sewuzem-rexiroravam-malorofaz-mojenavoberis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fd12b0ccf4e7.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/85c89e0c1.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/igpXEzJ/piano_tiles_magic_music_tiles_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/gegcX1C/corn_maze_adventure_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dixaleko/95236364039.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_off0000c1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B6 5112 bytes
SHA-256: 7efac90ed4d6a6b0294636dfca6876fecc5173ea06eb6cde68ed53dc3c3d501f
font_01_sfnt_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 10312 bytes
SHA-256: 1c9377bebcfb8b5f94aeb29610d5ab7e7dbe60654c06ba7dcb406041200172c5

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