Malicious PDF — malware analysis report

Static analysis result for SHA-256 16aea56fe1d5c005…

MALICIOUS

PDF

74.3 KB Created: 2021-02-16 13:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a50d7c664afd2f60923f2fa83a7051cf SHA-1: 69e81ff92a44ed5e926820b2814dcaa28088890e SHA-256: 16aea56fe1d5c005168e115d4cd6ff52ca8305de7634e9b58533fa06bc246192
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary lure pointing to 'https://druttle.ru/123?utm_term=how+to+do+a+good+presentation+for+an+interview', suggesting a social engineering attempt to redirect the user to a malicious site. The PDF structure and embedded links are indicative of a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=how+to+do+a+good+presentation+for+an+interview PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5fdec6c29dc36.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/gfjbvjg/basketball_stars_2019_poki.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/3941179.pdfIn PDF document text
    • https://poxigupi.weebly.com/uploads/1/3/1/3/131398264/8761277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450337/normal_5ff007258d82f.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/2160739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403407/normal_6007c2a4416c8.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/gjHigCk/55962787846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455639/normal_5fe02bd3677a0.pdfIn PDF document text
    • https://duxosefexi.weebly.com/uploads/1/3/4/6/134605181/linuwa-fatosevaz-keginifamoludo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_5fdb52f14a81b.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/HEihzhh/best_mauler_heroes_afk_arena_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fe86aec2ece4.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/cieTxt0/gowatevalev.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/rurovikejigibu/44801670387.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/carcassonne_gold_rush.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/17246326663.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/gukiku.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/gerudamunepatufusulisu.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_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 5288 bytes
SHA-256: 961ce4f11d3ed7fa866911476894bf994af4e50ab960f239bfe88e6142939e80
font_01_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 10548 bytes
SHA-256: f8ce0b84b95447bea6854dbf40407ae37a14cac14cdc74e8347a5f8365f81c52

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