Malicious PDF — malware analysis report

Static analysis result for SHA-256 81db16e54b44fa46…

MALICIOUS

PDF

78.2 KB Created: 2021-03-21 05:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 444f0a881d73263f1457f7e82349bb18 SHA-1: 1bac99bce3051f71fa4611722e8be0d3e063f71a SHA-256: 81db16e54b44fa46056abb7e839ececc147e66577869ba25af7a3d20663902b5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The document contains a large number of external links, forming a link farm, with the primary URL being 'https://botokaw.ru/wix?keyword=grindr+apk+download+uptodown'. This suggests the document is designed to redirect users to potentially harmful content or downloads, masquerading as legitimate application downloads.

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://botokaw.ru/wix?keyword=grindr+apk+download+uptodown PDF link annotation
    • https://cdn.sqhk.co/goluxewimabu/lgfjh3S/cat_runner_decorate_home_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vonewesipan/hajiNgf/60273998226.pdfIn PDF document text
    • http://sugoxebojun.getenjoyment.net/sir_arthur_conan_doyle_biography.pdfIn PDF document text
    • https://cdn.sqhk.co/pukojawutev/hgejjEU/guia_ceneval_psicologia_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_600c492fba6ea.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/qKajfje/gemipujujuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/a2iavfy/18999093819.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/96350630031.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/f6tiaj8/marshmello_wallpaper_app.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/hfrf8Z2/19793381041.pdfIn PDF document text
    • http://towexiwi.sportsontheweb.net/xisovewolunegeniduwu.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/eH6iiiI/trek_mountain_bikes_for_sale_craigslist.pdfIn PDF document text
    • https://cdn.sqhk.co/sulezudipozi/ojhjhUy/virtual_classroom_background.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5fff57813fafb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_6de7875355a54064b8543aba86dfcce4.pdf?index=trueIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/kerexanovur.pdfIn PDF document text
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_c1600e7442c34891a50644d4fe39861d.pdf?index=trueIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_b4ecd7a483f34e229b8e067ed5039343.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_d62e00a8acb44cd99011e2ae14ef6565.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_429a744ef03a49e4a9d557d62048d1f5.pdf?index=trueIn 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_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 4960 bytes
SHA-256: 4a06bfa94b930b935d390329b639c7e44e7de23c3d19478ff8c049ed4f3db974
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 12528 bytes
SHA-256: 51c16970894aeb33bd0a785f51f224b3ea5d3c048ffbcb54eaa9ac076fd804b6

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