Malicious PDF — malware analysis report

Static analysis result for SHA-256 572b26937df2d30e…

MALICIOUS

PDF

72.3 KB Created: 2021-02-09 11:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f88aa5937b14fa6d050bfdb287506bc8 SHA-1: 2a28041725f52136a324dfbeb32b4fabb0f0a32e SHA-256: 572b26937df2d30eb2b32eba98c7ff577251a21299eb15df53a87ed285c8b393
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or traffic redirection. The embedded URLs and the PDF link farm heuristics suggest the primary goal is to drive traffic to these external sites.

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://baarspo.ru/wb?keyword=nonprofit%20business%20plan%20template PDF link annotation
    • http://forsage.pw/tokyo_ghoul_sezonul_1_ep_13_subtitra7kwa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5fc6f2b8e4352.pdfIn PDF document text
    • https://pebufaso.weebly.com/uploads/1/3/5/4/135400671/vonuweragoxowif.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/jRgephd/bakowukoxerarowanu.pdfIn PDF document text
    • http://life-news.tech/planbook_plus_loginzzg8x.pdfIn PDF document text
    • http://easterthjg.com/voicemod_alternative_for_mac86lhl.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/cgdggha/xoretalebijukufep.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/dUgU2TP/tamla_motown_greatest_hits_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/jegjvLd/talking_wolf_movies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497075/normal_6006e15c55d18.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/jhgiYME/78916984524.pdfIn PDF document text
    • http://shoop-ft.ru/pukebinedewekevekar20gi.pdfIn PDF document text
    • http://copyright-security-ig.com/laluxuzimi57dkk.pdfIn PDF document text
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/xagutezaro.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/2hfdhh6/60480782622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 5156 bytes
SHA-256: 0356130769eddbe7cab07494ad020a49820d4a7eea1487ce61454d816c177d97
font_01_sfnt_off0000e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10628 bytes
SHA-256: ff6e38772ff81b6f08af46cbe6af1b1731c0dbe8d4762ffa8efcd5cfdea3ddb5

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