Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b3a19ce1005c91…

MALICIOUS

PDF

97.2 KB Created: 2021-04-21 04:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79d06bc34dbac16621bb7c66c2726bbc SHA-1: 247ddfbdf1b076e75370d13aa1f8755f80b2ce6a SHA-256: d7b3a19ce1005c91be9c170e0981948d8e32b919e198e4a3973f9091d0454d9d
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-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://seumenha.ru/strik?utm_term=japanese+mahjong+tips PDF link annotation
    • https://cdn.sqhk.co/bagadogod/Nhbhfih/silent_warship_hunter_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/D6FhhU7/chapters_interactive_stories_read_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/ihhegi2/final_fantasy_iv_pc_cheat_engine.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/Fhajbib/piwomumon.pdfIn PDF document text
    • https://cdn.sqhk.co/kekoseni/eHCCjhz/30965063125.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/egigjjm/you_are_hope_license_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/Ljjqhjj/fun_events_in_atlanta_next_weekend.pdfIn PDF document text
    • https://cdn.sqhk.co/seduregudire/chgmdQe/date_a_live_miku_song.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/ibm_lenovo_beep_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/iiNi089/muvasok.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/duguxawapososozigodosipij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopoduki.rf.gd/81800823686.pdfIn PDF document text
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_c9c3fed756d2412dad5319124befee37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90b3f58-114d-43f6-868f-b970105710e5/how_to_update_astro_a20_gen_1_xbox_series_x.pdfIn PDF document text
    • http://dofumuligo.rf.gd/fizoxotoruwakuzewaz.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_adf6f403e96b4d62ba2107ac217f5184.pdf?index=trueIn PDF document text
    • http://punefururoxifep.epizy.com/27088201894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2590955b-6b72-4892-a3a6-c03a86b789f7/bissell_proheat_select_pet_2x_not_spraying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653e348e-e9e2-424a-84e3-075ed47265ab/nokijibijikeforarafoxotet.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_31a5fb2bb0ba485f805c6bc4aebe7d9a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 23568 bytes
SHA-256: ef70164d8c7cf1854c7993542292f3c5344610883dcea5886ba0dc20697892d0
font_01_sfnt_off0001405f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405F 5168 bytes
SHA-256: 72256925fb654b0d352b93bc8c985fdc175c38f2792e6c8f30013a91132fb24c
font_02_sfnt_off000151df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DF 10892 bytes
SHA-256: f6e1d00ad134b7f03f3344603565e82f627440e514c9ffe39a90da09809ddd85