Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e679c15f5f0028f…

MALICIOUS

PDF

76.2 KB Created: 2021-04-02 23:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd2fc41cf94b645942ba2b34d60a0a69 SHA-1: 0cdb321a22869a42d043f0bbc4f6820e9096656e SHA-256: 8e679c15f5f0028f4d7c253b83084d4d98f137be94b4cf09c27f616db3852596
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or phishing lure, indicated by the presence of numerous external links, many hosted on disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/123?utm_term=oster+convection+oven+cooking+guide
    • http://kamikofonem.mygamesonline.org/9001_iso_2015_clause_8.4.pdf
    • https://cdn-cms.f-static.net/uploads/4481828/normal_6017687ca76bd.pdf
    • http://vijexibat.mywebcommunity.org/31688106623.pdf
    • http://sowipilarow.mygamesonline.org/kixepabojulagamop.pdf
    • https://cdn-cms.f-static.net/uploads/4493553/normal_6022fc6bae277.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_440b00f3cf7b47ee910c68b105b4504b.pdf?index=true
    • http://midelex.epizy.com/animal_planet_tv_app.pdf
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_d312ab91174244ccba009800dccaac45.pdf?index=true
    • https://s3.amazonaws.com/jesidofefe/aashiqui_audio_songs_free.pdf
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_48f7af8dc8cc48d5b89683f45993aacf.pdf?index=true
    • http://xixoxamevat.epizy.com/an_post_track_and_trace_number_format.pdf
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_e6f1317c8f624646a625e4f491c51bcc.pdf?index=true
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_c4ce8d652d544e0ebe9afe2440e87735.pdf?index=true
    • https://s3.amazonaws.com/legipalofi/android_oscilloscope_apk.pdf
    • https://ff5d1526-1eb9-447d-8915-67ca9933f1b4.filesusr.com/ugd/9565fd_b83881eb579742cc9a569c124e82420d.pdf?index=true
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_b102cdcac7bd462392607c190b8c490d.pdf?index=true
    • https://e2685184-9bcc-4d63-b126-5f7cf6655de3.filesusr.com/ugd/267f13_745c39d7e7f84cfa8c95a92ee5fbe316.pdf?index=true
    • http://zatupux.rf.gd/34147303461.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/formation_brancardier_ile_de_la_reunion.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_off0000e101.bin
f3e3db2c2a95a26bb097baa6464b8255893cf2a07f60bc4a456a163883a325c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 4900 bytes
font_01_sfnt_off0000f1c4.bin
5f2c9b68496885987458748777fe5327359a93795a113d58979be36c3c7fa158		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 10440 bytes
font_02_sfnt_off00011568.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 4324 bytes

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