Malicious PDF — malware analysis report

Static analysis result for SHA-256 4144964dd175a702…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 04:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b3f725df09d8e86a63caabf70e395ba3 SHA-1: b11428a2468479a64fb76c700ce1792604a4df04 SHA-256: 4144964dd175a702fc0ea27e4a1d4e9958e9e0dd9ca69b20c265208ad33ccfa5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://maypoin.ru/strik?utm_term=cook+essentials+air+fryer+chicken+breast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469841/normal_603fe6f4ab48a.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/gapivo.pdfIn PDF document text
    • https://loxerujose.weebly.com/uploads/1/3/0/7/130775489/df78d1cd1d.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/igeieih/vixukizoseposol.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/bhgh8Wn/vr_real_feel_racing_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/lenubire/FIhcj7v/jegotobuner.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/hhigidx/54902840136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_605d65bf7ae80.pdfIn PDF document text
    • http://raisinshq.club/instructions_for_a_pregnancy_test2g0u4.pdfIn PDF document text
    • http://leree4.club/is_fifty_shades_freed_on_netflix_canadaazabg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_603e86e07b532.pdfIn PDF document text
    • http://cccckkkkkdd.space/8588144519obqsr.pdfIn PDF document text
    • http://gnatural.space/smart_board_projector_blinking_red_lightpf77l.pdfIn PDF document text
    • https://tovexalo.weebly.com/uploads/1/3/5/3/135348509/2580211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_60154957c8809.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/buganabowumujef/rockola_power_amplifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5770d119-ce33-4f89-9d93-46cc5abcb3bd/math_problems_for_3rd_graders_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/12009682676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c7a0c7f-2926-4bc4-9873-c1c9c19fac01/93929476110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f019831-10fc-4c65-8176-c4d241ba7ddf/zedamivovoxuxuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac245cae-649e-455d-ac3f-39e0b8bd7427/how_much_is_a_rinnai_tankless_water_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/fiwegifirapojitinelafepal.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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 5180 bytes
SHA-256: f067de16a82031fcce0024736958b76b5ae655acfef8ef400b1238f5c87b4a3b
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 10856 bytes
SHA-256: 307dbe9b5764dfcc3dc7c5f26c756c691514fbefbb8e8ee065c137c9a1f33e36

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