Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fec75c4acdfa5d1…

MALICIOUS

PDF

106.1 KB Created: 2021-03-31 03:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0883de2803064d41bd7bcee98e4ee47b SHA-1: d456d843aa3e644231f61703c8afe91e4992c270 SHA-256: 7fec75c4acdfa5d1ef32ba9f68e42d0d5f159ecbf5b023b6a87418a24ab95198
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to multiple external URLs. One of the primary URLs, 'https://zajinet.ru/wix?keyword=case+studies+in+dental+hygiene+pdf', suggests a lure related to academic or professional content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/wix?keyword=case+studies+in+dental+hygiene+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449205/normal_5fef5c65da1f2.pdfIn PDF document text
    • http://forpost-electrica.ru/memisawigojoll8yms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_600da21467c0e.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/jgdjhjd/tisedufu.pdfIn PDF document text
    • http://mixedevik.22web.org/breaking_news_english_mini_lessons.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/fdqkjbx/coordinate_graphing_picture_worksheets.pdfIn PDF document text
    • http://natur-bio.space/41598353633h7hpf.pdfIn PDF document text
    • http://fsbsiod.com/tom_clancys_jack_ryan_season_1_episode_8_recap9nnjt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medomapex.epizy.com/sademudon.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_0e6cea37557243f8b85ccb58d7b6ec45.pdf?index=trueIn PDF document text
    • http://pomefeneliwawe.epizy.com/how_to_reset_daikin_ducted_air_conditioner.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_794387cf58d047f58417eacc0f2e9b97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resixexi/78673217236.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_bdbfd2a232854be29efd8c6627cc0926.pdf?index=trueIn PDF document text
    • http://vedaremix.epizy.com/navigator_of_the_seas_deck_plans.pdfIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_83d9216053074c8db928d4ca4d15e180.pdf?index=trueIn PDF document text
    • http://dukowiniwamew.rf.gd/bifemosidi.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/yearly_calendar_template.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_off00016277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16277 5216 bytes
SHA-256: a0d5f31a7d2962b902a1c61f3fc0c95d04c4e49308ac6974bf0e1c337ec4c88d
font_01_sfnt_off0001743f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1743F 11508 bytes
SHA-256: 7dd6debee50598423454dd6d0684179448edb80b0718e0aad0bf6fdd99f474cb

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