Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c534f0fdbc00edb…

MALICIOUS

PDF

74.1 KB Created: 2021-03-29 22:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b45802492cf9d395c8e27303a9d77404 SHA-1: c24f2bd3672fbf57e3a05a3f486181aa1f6e8a53 SHA-256: 1c534f0fdbc00edb3a469355100b1f5a48087edd3745b745f09911588a511169
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate SEO content. The primary malicious URL, https://xezojetit.ru/award?keyword=cerebrovascular+disease+treatment+pdf, is presented as a treatment guide, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/award?keyword=cerebrovascular+disease+treatment+pdf PDF link annotation
    • https://gefawopunov.weebly.com/uploads/1/3/0/9/130969454/113f8c.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/Nhjiehb/top_10_magic_mods_skyrim.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/6dd42.pdfIn PDF document text
    • http://fly-drive.online/how_to_transfer_a_call_nec_phonezpdik.pdfIn PDF document text
    • http://agencymedia-ig.com/the_wild_unknown_tarot_guidebook_kim_kransf6w97.pdfIn PDF document text
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/3909097.pdfIn PDF document text
    • https://fofosefekilom.weebly.com/uploads/1/3/0/8/130813764/fogawem.pdfIn PDF document text
    • https://wuluruvujomokax.weebly.com/uploads/1/3/5/3/135349857/cbe5140737a70.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/xogunepurat_marutigimugixu.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/jonabosusip_fotofuxawo_fuxoneso.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/fjeejet/petipowajena.pdfIn PDF document text
    • https://rulipativix.weebly.com/uploads/1/3/1/6/131607363/zagurakojegojita.pdfIn PDF document text
    • http://circulshtangcalip.website/lifetime_adjustable_portable_basketball_hoop_54-inch_polycarbonate6i9c1.pdfIn PDF document text
    • http://avbox.org/41963956714h6a3a.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/kavifunaruvi/45387956607.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/canzoni_italiane_karaoke.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/74236592663.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/jigufabuvinuz.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/skf_chevin_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/budutakomojimiba.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/colorectal_cancer_screening_guidelines_acs.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_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 5408 bytes
SHA-256: 8ae69d95db71e4da737e48aea869c3f52a1d3c93db354631a17c5af20c404a22
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10308 bytes
SHA-256: 8a050838d8ada61dd26255d13c218cb83a95412f134e8351613031fdd85d7d4f

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