Malicious PDF — malware analysis report

Static analysis result for SHA-256 1057c617a0cb28c7…

MALICIOUS

PDF

78.7 KB Created: 2021-04-04 23:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 908d25755c5c1dd16ca34ab7b743e610 SHA-1: 5622cd7b62a75cc8c8bb6d1caed407773fa4529e SHA-256: 1057c617a0cb28c7686320497a15006593e9f6cef49ee797a9ed85320efefc68
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/strik?utm_term=how+to+install+google+maps+on+iphone+7 PDF link annotation
    • http://ijmalan.xyz/ancient_and_medieval_world_historybsmtk.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/stay_with_me_goblin_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/ihkhfif/6874216864.pdfIn PDF document text
    • https://cdn.sqhk.co/gunumiku/hcihcge/zijapagujanowivawedabe.pdfIn PDF document text
    • https://cdn.sqhk.co/segidexu/0Fhhhge/86438034624.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/gedajewupetezetakogaluzo.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/din_en_iso_4287.pdfIn PDF document text
    • http://xozonline.ru/51982924383ye5bq.pdfIn PDF document text
    • https://cdn.sqhk.co/fupetabuwuf/aQifhdA/28311767734.pdfIn PDF document text
    • http://haustova.com/ridametefasawtxrmr.pdfIn PDF document text
    • http://presalon.xyz/preface_to_lyrical_ballads_1802wqyja.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/gghFdAB/87823944879.pdfIn PDF document text
    • http://cuzinfo.ru/citizens_capital_markets_analyst_salarygox1o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_e7d9c72689334c4c9c45a2e2c08e2a97.pdf?index=trueIn PDF document text
    • https://dd54f144-242a-4a88-9385-6c39f9996aab.filesusr.com/ugd/9f32c1_15352a6eb5a74428926432e8537f8447.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_d406e5cfdb894f8587a53bd1347cb2d5.pdf?index=trueIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_bfa5eff2efd149fa88a4ed5a8774ab10.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_d8b096ffe27944688c01e20a3f0ada2f.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 5268 bytes
SHA-256: a69941b2c522e049b2e87e35da38555a4a833350cfbff94338b712dd72a095c7
font_01_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 10624 bytes
SHA-256: 05d85e8ec591c64dd8108951250c9a24eee6df4b5a6b9eadfb4bd17c510f7671

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