Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c6d242cb72af73…

MALICIOUS

PDF

76.8 KB Created: 2021-03-06 01:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2f836cbff5155098b6bc0aeb7b8dd329 SHA-1: b466c11f72657c622eca3de7d35dcbbcc936c723 SHA-256: 77c6d242cb72af73e201d1f81fb096553d4f7402ebbe15fa0380c082dddef384
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of 'wget.pdf' in the document text, alongside URLs that appear to be disguised as PDF files, indicates an attempt to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://baarspo.ru/strik?utm_term=sennheiser+xs+wireless+digital+portable+eng+set PDF link annotation
    • http://jedugefipevama.iblogger.org/70210154402.pdfIn PDF document text
    • http://zedukibawubige.22web.org/chemische_formel_beispiel.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/dIyadhh/8187798337.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/oracle_12c_end_of_life_extended_support.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/ahhjjic/abc_song_nursery_rhymes_free_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/Rxhagi0/scr_screen_recorder_pro_lollipop.pdfIn macro / runtime command snippet
    • http://mevakimuvu.mypressonline.com/wizudeluw.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/hajbdpe/nhl_standings_2020_western_conference.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/higcgdu/ravipow.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/chgicZ3/tie_dye_t_shirts_mens_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/jjidbii/characters_warriors_orochi_4.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/ahhjjic/abc_song_nursIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b6cb5a1-0716-4815-a0ff-d4d806105337.filesusr.com/ugd/94e5ef_8c40edf247ae4618b9c1bafe2e058361.pdf?index=trueIn PDF document text
    • http://kimawawasero.onlinewebshop.net/rawuvebopudegetevowu.pdfIn PDF document text
    • http://kaguwetu.epizy.com/snow_white_with_the_red_hair_episode_6_season_2_english_dub.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/60608212691.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/gitlab_artifacts_wget.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/vinelopodizufopi.pdfIn macro / runtime command snippet
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_d686dff8fd9648e49ae902c4436f551c.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_aac60083e2b54472bddebbeb1152e46c.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_95fb700e723d4252ac7bfd49568c7ff3.pdf?index=trueIn PDF document text
    • http://jabukiwus.epizy.com/losox.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/23350130077.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_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 5624 bytes
SHA-256: bb341686645db4d9f8ccba33135e6369492d3916048fa4d40def6995413ff239
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 10712 bytes
SHA-256: 11b123e12f4b8173e0967694dfaa1a8fd8785506ba16dbf3b8899298429645a9

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