Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc70a8d53dcd205…

MALICIOUS

PDF

84.4 KB Created: 2021-04-02 14:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e33f57628e897026bd2f56fc216e45d SHA-1: 8d9a03d139229d15739bc9fb9c6b1109b95768ee SHA-256: 0cc70a8d53dcd205410fd957b3ba1d9585e05d1a105f086c6439f165395dbb53
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm designed to redirect users to external websites, with one URL specifically mentioning 'auto clicker super fast pro apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure itself facilitates the redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://vilenefex.ru/123?utm_term=auto+clicker+super+fast+pro+apk
    • https://cdn-cms.f-static.net/uploads/4450036/normal_6057e2b67085e.pdf
    • https://cdn.sqhk.co/keliziniw/hhhghcS/man_down_season_1_episode_5_cast.pdf
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5fe6174a74213.pdf
    • https://cdn.sqhk.co/minamojazi/hf1ghFU/k_yamet_kombat_arena_mod_apk.pdf
    • https://cdn.sqhk.co/miwavilusaji/ibgc3ja/regal_cinemas_near_me_showtimes.pdf
    • https://cdn-cms.f-static.net/uploads/4379377/normal_60628f92b940c.pdf
    • http://startask.ru/how_to_use_math_functions_in_libreofficet0xrb.pdf
    • https://cdn-cms.f-static.net/uploads/4527859/normal_604f065336211.pdf
    • https://cdn.sqhk.co/gipakegabav/8cgdljf/kindle_fire_apps_on_android.pdf
    • https://static.s123-cdn-static.com/uploads/4463560/normal_60027dd10fce9.pdf
    • http://agent-ritual495.online/auctiontime_results_trucksi1ngt.pdf
    • http://fbcopyright-center.com/how_to_find_subnet_mask_from_ip_address_in_linux3pmq4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ruzuvune.epizy.com/powerpoint_slides_free_2019.pdf
    • http://fawivemepogu.epizy.com/netbeans_for_mac_yosemite.pdf
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_85d504f7ff1e4fccbf7749289a3c4d7f.pdf?index=true
    • http://lilepav.rf.gd/5540924840.pdf
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_4835f39c63344c69bf3c62e857da1c6c.pdf?index=true
    • http://xijotat.rf.gd/black_and_decker_quick_and_easy_food_processor_manual.pdf
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_481f9d8119a44169bc9dceb09ef0889c.pdf?index=true
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_e9f39a81b0fb4707828b07b675a1b3b9.pdf?index=true
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_963b52238fc047bf84b7a13a73a56f8e.pdf?index=true
    • http://xumesata.epizy.com/sikegexavogumolosexuw.pdf
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_76f695948a7645dda27c79862386f7e4.pdf?index=true
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_07fdf30f1c8444ff85de2eac15cbcb15.pdf?index=true
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_ea943f79c7764f118375e23d516e2096.pdf?index=true
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_923ac51c50044aecbb0bc72f9d23d062.pdf?index=true
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_191e6584a5b8459d98f95eddd0482e84.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a7.bin
e24e74b9b04a3867fefa51b5b88dace74ace49a6bceeeaa8aa59c86445c2e3c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 5064 bytes
font_01_sfnt_off000117f3.bin
fff86a262420fe21e1165df77f458ecf9698fd60c0140cf1454b899f89a61d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 13324 bytes