Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a417d8a84f6e11a…

MALICIOUS

PDF

86.1 KB Created: 2021-02-23 03:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ae70b6f93a477cfa5c1eb5fd18c6d1a SHA-1: e5211e90239f1a1187a791f633e791110ac1f0a5 SHA-256: 5a417d8a84f6e11a6f1ef7af0cad2d4e034434f5f915bca9bc08a6e808e61fe3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosted on services like sqhk.co, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a pattern of luring users to potentially harmful external content.

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/wix?keyword=ffxiv+shinryu+domain+guide PDF link annotation
    • https://cdn.sqhk.co/tenotitur/igOpBhg/ant_art_tycoon_hacked_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/aNhbQgd/glow_tic_tac_toe_bluetooth_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/jigfij1/zewetikedulogirizaz.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/iicLgeN/kodofilobuzolob.pdfIn PDF document text
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/kewabe.pdfIn PDF document text
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/sotuviragivuma.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/f1329e498.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/5fce2aecae.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/bugowawogifij.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/pazovugal/53006491657.pdfIn PDF document text
    • http://likijanima.epizy.com/12251072060.pdfIn PDF document text
    • http://dovovefuwaxav.epizy.com/gopimilanezetux.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/revufopopifatejumesa.pdfIn PDF document text
    • http://fuwotatikiluwa.epizy.com/srimad_bhagavatam_1st_canto.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/52640409893.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_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 5472 bytes
SHA-256: e76167965edfad4a6294993e47ff1d07a55fb2dd72e6f1b33e33af2661cf6bae
font_01_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 10308 bytes
SHA-256: 4e609faf4b97365be884c3acf51ef23f9e6156588f689d56126ba4207fccddaa

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