Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf42ba87609e861…

MALICIOUS

PDF

81.4 KB Created: 2021-03-22 13:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d5a1bd79bba341b05450937976b158d7 SHA-1: d9ae216c48880d1ce165b51abcbb04eebe9c8ff0 SHA-256: 3bf42ba87609e861f743dc649fcfef93c2d47c07909a5c9fd17cea809da0231a
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 0.9967

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://pelibifir.ru/strik?utm_term=what+is+cannery+row+monterey PDF link annotation
    • http://homeolimp.com/nupigufywpj.pdfIn PDF document text
    • https://cdn.sqhk.co/rapedipular/Tiazijo/phage_the_untouchable_edh.pdfIn PDF document text
    • https://sofofiwolasaxu.weebly.com/uploads/1/3/1/8/131856039/pubofuvalo_nulezafonanep_diwulo_bowupus.pdfIn PDF document text
    • http://itasummer.fun/transformacion_isotermica_e_isobaricacdv2a.pdfIn PDF document text
    • http://glawerry.online/69393672847dzdhs.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/9660789.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/gogajoxo_koselesuwokes_soposaw.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/0bf90f5bc573.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/jaAO7hj/against_the_clock_movie.pdfIn PDF document text
    • http://instasurprise.online/66636342278zuete.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/heYiaNI/earth_wind_and_fire_devotion_song.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesavif/wij6hex/2832847220.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/9c277a4e.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/Gaogihe/csr_racing_2_hack_apk_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/sql_server_2016_localdb_32_bit.pdfIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_3adc8f82793241669eb5065d9cd8a19d.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_abc11d64da5e4da5afc626d7a9cc778b.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_586ed3c66cbc4edbbc244cb61a7e1fdb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/jewalesita.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_eed2feafd6794b64aae9b0bed0973555.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_68491ab8478f46758eec188b0cdc05a1.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_396af48aac724f00aaa83794e601ab3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/pressure_transducer_symbol_electrical.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_7fbad028e0994937aa4974c8212eaf89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/sekonic_l-308s-u_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/kovivu.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_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 5216 bytes
SHA-256: b089905f46801c363ff4669714d6335017f1d86a018f40b0da6086c10bc7541e
font_01_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 11424 bytes
SHA-256: 291a25c2284b7ac27ee32324cda3b48f309df4055ec1d051fd0125d43da0d11c