Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdd606e8481d4c6…

MALICIOUS

PDF

81.1 KB Created: 2021-04-04 22:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ac61d623ba86965c1c5d57568b88e66 SHA-1: ac3d141ea57d52a3b13a038fcdf361b9c0547f34 SHA-256: 2bdd606e8481d4c6572acf1f04ca336f1b3e4138ecfcb6fbf27219c9ae596df4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://botokaw.ru/award?keyword=berio+folk+songs+pdf PDF link annotation
    • https://cdn.sqhk.co/gevagedubop/sjiuW3T/download_real_drift_racing_road_racer_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/iZHibSm/23850991331.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/geJJhg9/nowosotajepatinewedov.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/hjyghgg/sabewigatuteduluxifuru.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/nGnvjcW/unduh_game_dome_of_doom.pdfIn PDF document text
    • https://vubisurajoguv.weebly.com/uploads/1/3/4/2/134265568/vamutefijuwuro-kijetuxifunobe.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/csUpgft/canadian_country_music_awards_nominees_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/gMSwW8Q/rail_rush_2_game_play_online.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/60259720207.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/paulo_coelho_libros_adulterio.pdfIn PDF document text
    • https://nabikiwajozipaf.weebly.com/uploads/1/3/5/3/135391661/6642152.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/jjjdha4/warufikonelesub.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/seated_arm_exercises_with_weights.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_7f29aaeed5964d9c90a587b586d16d48.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_75818e67fff148b3961fa4b7d8d5bbce.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_383ca3a2c8e64b3c91133fe6503dfa42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/89174234293.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/what_is_a_piece_of_pottery_from_ancient_greece_called.pdfIn PDF document text
    • http://luzojora.atwebpages.com/jpg_to_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/in_monopoly_can_you_collect_rent_while_in_jail.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 4820 bytes
SHA-256: f7fcc63df9663b3998d0d02b30fef1ea85c5c5dabcfb748b575f6c2bffdd7688
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 11472 bytes
SHA-256: 0bc864c25444b68446f606a46dfac665e16ac9b6145db817192c1e5ea913a1b5
font_02_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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