Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea74e276797964a…

MALICIOUS

PDF

74.8 KB Created: 2021-04-05 01:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64baf933740d9dff8f751aa38044a55 SHA-1: 110f147675a2257d9e1ff439836f7471258eaad6 SHA-256: 6ea74e276797964aa1781c242a01fb62af4d1b0f582f79886bbe06a27df8d5f5
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The presence of multiple external URIs, including one pointing to 'dafemum.ru', suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious workflow designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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://dafemum.ru/wix?keyword=wayne+trace+school+delays
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5ff32a9b71ca2.pdf
    • http://ziposodepow.mywebcommunity.org/82555560348.pdf
    • http://kugewezebuvigiw.mygamesonline.org/alumasc_heritage.pdf
    • https://cdn.sqhk.co/moromasi/bMhjgfl/conspiracy_palette_morphe_store.pdf
    • http://xubanapirobula.mypressonline.com/apgli_benefits_in_telugu.pdf
    • http://dikoxikikalonib.scienceontheweb.net/livro_biotecnologia_industrial_volume_4.pdf
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5fe232d5e4257.pdf
    • https://static.s123-cdn-static.com/uploads/4367004/normal_5ff66bb2d8654.pdf
    • http://pumorux.medianewsonline.com/machines_like_me.pdf
    • https://cdn.sqhk.co/retobumoki/ijidv3Y/lurodofavumodidobi.pdf
    • https://cdn-cms.f-static.net/uploads/4473053/normal_6041e73983994.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_fde7650997cf4bef871f416a7908bf06.pdf?index=true
    • https://s3.amazonaws.com/tugumeb/angular_call_component_method_from_template.pdf
    • https://s3.amazonaws.com/lososimap/55388053739.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_503acfd400c94b6dbc2b06abbad14795.pdf?index=true
    • http://bugazepoja.onlinewebshop.net/padelo.pdf
    • http://nuwadolonopip.onlinewebshop.net/ways_of_the_world_textbook_chapter_16.pdf
    • http://fazobelo.onlinewebshop.net/mutoruv.pdf
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_26758b60ea2d461c9afb874c4f4a7d02.pdf?index=true
    • https://s3.amazonaws.com/nazekisigiduz/how_to_reprogram_viper_alarm_system.pdf
    • https://s3.amazonaws.com/wopari/beach_buggy_blitz_apk_uptodown.pdf
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_50a7b02832df46b796a13efcc66aaf20.pdf?index=true
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_f2f33b59350642e5a753a2f2e63bdf5d.pdf?index=true
    • https://s3.amazonaws.com/zobuwubedak/best_dance_music_hits_90s.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db94.bin
922582331937b0268f48d6847655a2f44f787f7dd14a10e26e800a4587469a84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 4880 bytes
font_01_sfnt_off0000ec23.bin
620aae1b16597dafa24a24870ec9491e812063bb4182306b406cd383ad395ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 10524 bytes
font_02_sfnt_off00010fdb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 4324 bytes

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