Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2a7706dc91200f…

MALICIOUS

PDF

74.6 KB Created: 2021-03-03 10:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ccf6822b6995f47aac98ee5bc5a86721 SHA-1: 79d6accaab95c0abffac2c31c78282cedc99941b SHA-256: 4a2a7706dc91200f62d4740d0e412e2137547fd506a1712b6795abefed9b6b14
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary function appearing to be directing users to potentially harmful content or for SEO manipulation. The presence of numerous external URLs, many hosted on disposable domains, supports this assessment.

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://ponafet.ru/award?keyword=what+is+a+covid+assessment PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368969/normal_600bbd688b76a.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/bEhdKX8/dude_perfect_tour_video_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xomifinetepi/hdKghoT/3d_escape_game_puzzle_room_13.pdfIn PDF document text
    • https://wofiwajelakezod.weebly.com/uploads/1/3/6/0/136092853/8082596.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/rijigorufezas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5febe60b56d14.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/ihjzjae/liverpool_sport_news_liver.pdfIn PDF document text
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/xadirariwumafot.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/bgcaig0/65043605603.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/5idjhgj/68595664859.pdfIn PDF document text
    • http://bestunew.xyz/konukoxpxu8v.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/w9BeicB/marshmello_4k_wallpaper_for_iphone.pdfIn PDF document text
    • https://gadepututam.weebly.com/uploads/1/3/5/3/135325389/2655929.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/3blkJhf/maxurim.pdfIn PDF document text
    • https://liduwofixuxobef.weebly.com/uploads/1/3/0/7/130739348/wukewuze.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/fRbrEij/drag_sport_bike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vazavaxajude.rf.gd/foguwiwupevux.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_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 5124 bytes
SHA-256: 66444d41eca22e8c822e7738423557fbc8eb4b96231946d583e235ad525c9f7c
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 10040 bytes
SHA-256: 197b8905d21f6b976a9ed0958fb42c74812a2672849e8122b793b24c6523c981

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