Malicious PDF — malware analysis report

Static analysis result for SHA-256 1343ed3d7a21db84…

MALICIOUS

PDF

66.5 KB Created: 2021-02-18 09:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ac60ca4120e6209ee4015f2d47fffa31 SHA-1: 14b02c1adb9d223a606215771628c423da8f6f8e SHA-256: 1343ed3d7a21db8484a4b982f53d7bcff121e2080a50de8a1c4edb5a502036ee
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no direct instructions or content that would indicate a specific user-facing scam. The primary malicious activity appears to be redirecting users to a multitude of external URLs.

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://seumenha.ru/wb?keyword=ipod%20nano%203rd%20gen%20bluetooth%20adapter PDF link annotation
    • http://life-news.tech/azur_lane_eagle_union_fleet_guide53esm.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/hi2T3ij/xapujotiro.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/1150806.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/9994627.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/tuuighf/tugok.pdfIn PDF document text
    • http://sodahq.club/xufagog6rgfm.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/jurep_nopuf.pdfIn PDF document text
    • http://meetsucre.pro/devmatik_eitimhane_com_4_snfoo426.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/jQGgghe/hill_top_bike_racing_game_download.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/favurimudal.pdfIn PDF document text
    • http://webmastervlad.ru/ditarapitapalux9a2m.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/jhgeO2R/wilejerijadivedoxiwerowom.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/eipxKvE/24824326872.pdfIn PDF document text
    • http://batut.space/sovulusaxanojaweml6i00.pdfIn PDF document text
    • http://tryplafond.xyz/bepawe0ami9.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/bededuxotulapil/gozizuwejap.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/zisarodunatuketesa.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_off0000c62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62F 5284 bytes
SHA-256: 852c6ce513434f85894414d5d396de425f322e0f8614e45e11b92369e3b8fb05
font_01_sfnt_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 10368 bytes
SHA-256: 26a40296b16e3c0fe10bae89ecad01a48bd5bbc83c4dc107dccf753321d0daa1

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