Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aac191172f74b7…

MALICIOUS

PDF

66.8 KB Created: 2021-02-02 22:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c2606806c0bd4ea1b018312e261be793 SHA-1: b59c22ff8630347550507b6b2ee1348a0e58a349 SHA-256: a5aac191172f74b73f8462d9596d4171261c444e041d0cabc4bdfc9c3a392822
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users through deceptive links.

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://jottigo.ru/aws?utm_term=pakistani+channels+app+android PDF link annotation
    • http://zikapipumimapo.22web.org/82811415936.pdfIn PDF document text
    • https://cdn.sqhk.co/pefibovip/hcgfBib/idle_plague_pandemic_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/hfGjcqK/best_hearthstone_deck_tracker_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/IjgPicH/21865785153.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/felgiji/tunnels_trolls_solo_adventures.pdfIn PDF document text
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/0dcc723cdcd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_60149e8ce4d35.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/jcja2jb/brilliant_earth_promo_code_august_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fe6fcf423302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501975/normal_5ffbb8595dd06.pdfIn PDF document text
    • http://unonatur.space/4388509572f473f.pdfIn PDF document text
    • https://cdn.sqhk.co/kabolode/gcidQtt/26322196003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuruwabudakase.epizy.com/fibromyalgia_guidelines_nice.pdfIn PDF document text
    • http://doxewadafexe.rf.gd/62769013212.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_off0000c7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F0 5224 bytes
SHA-256: 498c3f49a69f8ae6ec83bee2a1b56310ece9a84c85ba176c40f80fa24cfd116e
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 11080 bytes
SHA-256: 3237fcbb9d2018f12b9a7de60df39ebf8c14e7126eba63d5e251b5bb4d40b1a7

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