Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84aae50bf12ba8d…

MALICIOUS

PDF

80.7 KB Created: 2021-03-29 07:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fdb7b034533890d1997eb4516203d41f SHA-1: e42c8a5ac84cb9cd1351379592fd8a0e4d40a8c2 SHA-256: f84aae50bf12ba8d398e5918445cfd3632ec9f41fca859cdcd36e7d22283a327
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, which is a common tactic for distributing malware. The document body, though heavily obfuscated, suggests a lure related to 'amu admission guide 2020 pdf', aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=amu+admission+guide+2020+pdf PDF link annotation
    • http://alcexpress3.xyz/63280693137mhi4n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_6004e8f63b0e7.pdfIn PDF document text
    • http://pusovemolexed.scienceontheweb.net/14334660942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_603bd7fcd18bc.pdfIn PDF document text
    • http://serdyukov.pro/vejavatadanozitafujunadgkt3.pdfIn PDF document text
    • http://fruit-citrus.space/pamagw6ei3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_604847c717976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fe655b8ab077.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/vativetadamoxosavepimif.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/a_discovery_of_witches_season_2_episode_release_dates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_6054b5d089ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_602f50754fd92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_6056e47a39ad0.pdfIn PDF document text
    • http://satogolijosefas.iblogger.org/ancient_greek_architecture.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aae5782-30ff-48b8-9633-6648f623e461/dituwadubudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beaaeefd-4605-4c5b-a640-23fb85d1788a/what_does_ulysses_by_tennyson_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4826e59e-f48b-4e6a-9c9c-6eb2755a7a68/sogigerapez.pdfIn PDF document text
    • http://verulufana.rf.gd/area_of_circle_word_problems_worksheet.pdfIn PDF document text
    • http://kugezukakig.rf.gd/au_aw_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbfa2d61-c08e-4560-93c2-d2afff8cea44/the_merry_adventures_of_robin_hood.pdfIn PDF document text
    • http://rodukamofuf.epizy.com/31053952764.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_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 5496 bytes
SHA-256: 99d44fe9d9a465eddbdf98aa5214ca923860272b35c1350bb7fba64a3557c729
font_01_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 10812 bytes
SHA-256: 10227bb0c77d7e3cf9aee08e29231e0f1a966d79f71d657fb092196a75bbca58

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