Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c4bdbcfbb25d87…

MALICIOUS

PDF

73.2 KB Created: 2021-01-28 18:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2443f7991b58389967f2168a0ffc3cf7 SHA-1: ae2c613c4c5bce5ec096ce013d97f19ad3a3f5d9 SHA-256: 52c4bdbcfbb25d8798279d341eced415fb7c8238c9b99999b076355c5b48d125
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, with the latter identifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=crashplan+ubuntu+log+files PDF link annotation
    • https://cdn.sqhk.co/jetirivotu/FhikhfA/54793695076.pdfIn PDF document text
    • https://cdn.sqhk.co/siwowoso/6hhieyr/poland_president_election_2020_results.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/ijggjaf/octopussy_james_bond.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/jijjgg9/dumuko.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/esThasL/joshua_bartley_coin_pusher_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/hjcvuTr/word_family_room_decor.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/2788545.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/qgic5a7/sixej.pdfIn PDF document text
    • https://cdn.sqhk.co/bagudivibi/AgcyQHe/acetaldehyde_peroxide_formation.pdfIn PDF document text
    • https://cdn.sqhk.co/baponakazu/5dbEieg/frontier_fios_tv_channel_lineup_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/kgcjeQD/carson_city_dmv_vin_inspection.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/ghFgd3W/top_hits_of_the_70s_rock.pdfIn PDF document text
    • https://cdn.sqhk.co/riluvexudeve/jdu7hbS/city_island_tm_builder_tycoon_mod_apk.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/fopalew/ghost_house_2017_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/aaja_nachle_songs_djmaza.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/75762744981.pdfIn PDF document text
    • http://fefemegazo.rf.gd/4g_voice_call_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/disciplinary_letter_templates_free.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_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 5208 bytes
SHA-256: 120984bdedc832e62d08ca51624443d796ac65c220eb0ce9530964506e2073de
font_01_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 10896 bytes
SHA-256: aa335f0a33da0f6d1f2586f6121445001d18131f0978b01c921193c50fc5ce82

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