Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67757aaffc25846…

MALICIOUS

PDF

73.5 KB Created: 2021-04-29 01:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 98cfa0f8f8520ed81687b960928b34c0 SHA-1: d2f0dda3b45a4fda1ec901bb3a0c4e7ddcbe34a8 SHA-256: f67757aaffc25846577f4c7b37430cfed46a70abb7b7574734f0a83a5dfbf09b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to direct users to potentially malicious sites. The primary external URI, 'https://xezojetit.ru/strik?utm_term=monitor+card%25C3%25ADaco+polar+m430+c%252F+gps', suggests a phishing or malware distribution attempt disguised as a product search result. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=monitor+card%25C3%25ADaco+polar+m430+c%252F+gps PDF link annotation
    • https://cdn.sqhk.co/zetobazox/ieJw6ia/play_free_games_online_without_ing_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/jqnhejb/voice_over_asian_game_show.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_603e7694b664e.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/YWichb6/virgin_pulse_mobile_app_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_6023c09e95615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_5fd33233a692c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5fe6a8a4998e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5fff6a1476a13.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/hcifu6r/las_vegas_day_trip_to_los_angeles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_6022a31ab5f67.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/eZSwGgh/second_hand_clothes_close_to_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_605c155848264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_605465b531d41.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/e89801a4-bdb7-4a3e-8c35-5ea801ea45df/sunufilonefimop.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_8f438cb46d90418dadec035e713c47c5.pdf?index=trueIn PDF document text
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_1fcfada3d3634b0f83d6055106612a22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98891694-8005-4333-9f4e-f19bbba80bd8/pride_and_prejudice_piano_book.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_bcb8dcebb702467da6cedf3ff55bff95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ebcd9b-60f8-4cad-9322-e224da51ddaf/philips_norelco_multigroom_5000_blades.pdfIn PDF document text
    • https://9505ca4c-dfdc-4941-8fde-ded35496d0c9.filesusr.com/ugd/2097ab_5bf18d4ccece44c39bc6226218569c0b.pdf?index=trueIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_88834ca6afea4f98be06f515c2077c8a.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_ba6d656ab1a04d648baca90f24f4ff46.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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 5884 bytes
SHA-256: 735ededcb38d4af09be8c81e98ba8c5e82db745f1cbe919d7642d4d668998cbf
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 12380 bytes
SHA-256: 6720ed028647df43e630b2a88197384136be810415d8f18e43bb54dd76c1a26d