Malicious PDF — malware analysis report

Static analysis result for SHA-256 4358e652a9588c8e…

MALICIOUS

PDF

82.2 KB Created: 2021-02-07 19:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c3723290f6d69d8870de04becae60047 SHA-1: 49632e080c1ed18e1678354651057512e14ca772 SHA-256: 4358e652a9588c8eb3e29aa88544a88591daf0239580f0f0f172d36ae373c01c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/123?utm_term=epic+seven+catalyst+farm PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369936/normal_5fca3c59258de.pdfIn PDF document text
    • https://cdn.sqhk.co/zipuzedozame/ifgkCjg/angry_dino_attack_city_rampage_wild_animal_gamestop.pdfIn PDF document text
    • https://nazorokofewedu.weebly.com/uploads/1/3/2/7/132710677/3457887.pdfIn PDF document text
    • https://kunamugak.weebly.com/uploads/1/3/0/7/130739026/5761110.pdfIn PDF document text
    • http://wodunobogigav.22web.org/wuriramanekun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5ff9f73dc541d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5ffb5bc608276.pdfIn PDF document text
    • https://wewuketis.weebly.com/uploads/1/3/5/3/135327502/8682645.pdfIn PDF document text
    • https://cdn.sqhk.co/gufadiviw/hhVfjcv/wii_u_emulator_macbook_pro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6011b594c97d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_60177010bc96a.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/4335696.pdfIn PDF document text
    • https://cdn.sqhk.co/ranuvore/gfyueif/kuxiganiwog.pdfIn PDF document text
    • https://totidisej.weebly.com/uploads/1/3/5/3/135323484/jovogawozatisejaxa.pdfIn PDF document text
    • http://rosotorejujuv.22web.org/fugeduwapoguxe.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/sulasatevirexo/52287056411.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/activemq_5._15._4.pdfIn PDF document text
    • http://zamituzok.rf.gd/whatsapp_video_2019_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/cover_letter_for_job_template_word.pdfIn PDF document text
    • http://tirinito.epizy.com/nazagana.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/all_in_one_gestures_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/57334471694.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 5280 bytes
SHA-256: 1db4835ccd30a56530cc00161d456d6ae19cc5d8ef536f202fdc754aecc15ddf
font_01_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 12012 bytes
SHA-256: e1d194cc22bb3087e158d6009d9c8d53296db647eff086c1d76ff2439097d74e
font_02_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 16204 bytes
SHA-256: 514ec34c774379c82780ce3b826aceada3291152a2a4734d997485cf707bbc49

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