Malicious PDF — malware analysis report

Static analysis result for SHA-256 337d3ab32f4c0a81…

MALICIOUS

PDF

77.6 KB Created: 2021-03-08 09:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b8b483f7aff6af0ece7d20eab4bde566 SHA-1: 8ef56a752ccc7a5b4c4b636b02abc21dcd81b512 SHA-256: 337d3ab32f4c0a81f551a7a59b8c32788f4d09ffbe05cbbf24ce68131b34a35e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to various external PDF files. The document body, though partially corrupted, contains a URL related to downloading software, suggesting a lure for potentially unwanted applications or malware. The presence of numerous external links, many hosted on disposable domains, reinforces the malicious intent of distributing content through a deceptive SEO strategy.

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://bologen.ru/wix?keyword=download+happy+restaurant+story+mod+apk PDF link annotation
    • https://cdn.sqhk.co/fapiwejagiz/azF3yRA/photo_audio_mixer_online_free.pdfIn PDF document text
    • https://jiwalevimube.weebly.com/uploads/1/3/4/8/134870165/pikosur-kupejewunaw-fisesini-xegodutajer.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/fikinafokafufato.pdfIn PDF document text
    • http://astropsychology.website/dometic_duo_therm_rv_air_conditioner_troubleshootinghxxnt.pdfIn PDF document text
    • http://trendmobile.ru/vowaxelunidono4zgyz.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/2vjiMmn/2_cars_3d_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/hkhgpjg/who_won_the_arena_football_league_championship.pdfIn PDF document text
    • https://cdn.sqhk.co/vofemolat/XBjajgT/fewerexoxejavazidusijor.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/etibAgv/69917824069.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/rejoso-wakijopexuz-talisegiwosafim-bowolexunir.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/cibggc4/mini_basketball_hoop_replacement_net.pdfIn PDF document text
    • https://pinagoremomaj.weebly.com/uploads/1/3/0/7/130738806/pujemebujijojor.pdfIn PDF document text
    • https://cdn.sqhk.co/bularalunop/g3hkggz/71778659429.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/bQjeIij/broken_screen_prank_iphone_x.pdfIn PDF document text
    • http://lavkavkusa.store/signs_your_water_softener_is_not_workingaf260.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/which_fruits_are_gluten_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_eb8d240cd901417f96a90960d93fad05.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_4368a07bddc94349afd5177f075700a7.pdf?index=trueIn PDF document text
    • http://sofibimibojas.myartsonline.com/rixixusipoxevukov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 5288 bytes
SHA-256: ea62ee1cb8d6a5654e54a115d512d95afdf77a55f783973f6b40b2e02e4186cd
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 10440 bytes
SHA-256: f778fcbacae883b4225b83dcb761ba7225fffa35fa8b56194849171738123f2d
font_02_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333