Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cf78757c2a8f35…

MALICIOUS

PDF

80.9 KB Created: 2021-03-18 18:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc877ce2efb419fe5931393875eb0ad1 SHA-1: 9ee1197ac8b9d7c529384518e5fa3ef49656c4fc SHA-256: 72cf78757c2a8f3558521b2c8d064493bc7c4f038ce30ab4d874d14de3c538ea
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 0.9993

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=waste+management+project+proposal+pdf PDF link annotation
    • https://cdn.sqhk.co/faserekino/d9gdje7/xotedosefewewososamarizaz.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/highgs5/logaxugotazujenabezu.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/5Dgfhjl/naat_flute_ringtone_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hIjeiiU/82347520608.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/35648891630.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/allen_key_notes_homoeopathy.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/C3hfgdm/best_country_music_radio_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/cjaghjc/73825555379.pdfIn PDF document text
    • https://cdn.sqhk.co/sisagoku/ifaLPfe/3357060977.pdfIn PDF document text
    • http://blankid.ru/average_salary_for_masters_in_business_analyticsjxfte.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzukada/bhLt7a9/lp_dreamer_lyrics_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/P65hbhg/vl_video_player_iptv_android_tv.pdfIn PDF document text
    • http://front-glass.space/gelatine_sheets_nzom9yn.pdfIn PDF document text
    • http://instapriz.site/53389712890a5o3y.pdfIn PDF document text
    • https://cdn.sqhk.co/wemofisejaf/2ibNgeY/one_gotta_go_meme_food.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/72949905463.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c516b108-1b25-4e5c-86a0-2b2c1d393c28/speaking_up_without_freaking_out_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca7d626-75f2-4359-ace9-ef1a1e570749/42331058273.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_6a70dd0bd201433d806265c95bbd71d5.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_554bd24ba221405d85ccd2fcafb2c117.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_8b830e2a4d2148b186a8658df8cfc15d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47141fa-b045-4292-8bf6-dfa73ce1f042/how_to_ignite_gas_water_heater_rheem.pdfIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_7bb9697b94cd406892e7bf89a80df2d1.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_6c1e23528f3f4c219930b043a6bf4bad.pdf?index=trueIn 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_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 5564 bytes
SHA-256: 0a0d969e5693d75ebe0d27c7554ea6eb0e5fafcc09b6bb2bdd52f42eac4ee4f6
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 11116 bytes
SHA-256: d0a4787f9ef86e99175061b68a632adae5478680a1e404e0ff995f02a671e606