Malicious PDF — malware analysis report

Static analysis result for SHA-256 a819aae9ef993337…

MALICIOUS

PDF

93.1 KB Created: 2021-02-26 05:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3ad4af431c3e0b3dbf48355674609b8f SHA-1: 49f7cc1419b7705ccb50d2449393c7a369172934 SHA-256: a819aae9ef993337c6300453de76f989b2510b0212b9f98fe244ffd93c5b1d79
244 Risk Score

Malware Insights

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

This PDF file has been identified as malicious due to its structure, which includes a large number of embedded links pointing to various external resources. Several heuristics indicate that this is a link farm, with many links hosted on disposable domains or redirectors, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+does+for+mean+in+algebra In PDF document text
    • https://cdn.sqhk.co/goduwonon/chdiahi/texabexuliwunununozaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/cijw8jf/57731953365.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hpihKib/top_league_soccer_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/igigi8P/dingleberry_definition_oxford.pdfIn PDF document text
    • http://fizadote.22web.org/supelalefazuferime.pdfIn PDF document text
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/waxuviseratol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_5fc773b3ef6a1.pdfIn PDF document text
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/lususofawera.pdfIn PDF document text
    • https://cdn.sqhk.co/titubebojek/Phc5Ejb/19601789847.pdfIn PDF document text
    • https://dawikuwavuvuka.weebly.com/uploads/1/3/4/8/134866752/3792777.pdfIn PDF document text
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/3547529.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/9476486.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/dazovosugev/gameboy_advance_emulator_android_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/vapijaximewunelavuxuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/zamiparafofanorepodo.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/fotetivevomigovi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013a4d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A4D 25300 bytes
SHA-256: 62fedebaecca62f5c72baeb9acec24ab029f9aab0c33c4ea452b8629e6911a23
font_00_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 5476 bytes
SHA-256: 127d7389fb3a7a0fcd89debf01e31b5e8f03e369c63dc80e63d0243d603751bf
font_01_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 11928 bytes
SHA-256: 6c0ecf44d41b879ba1ad620381ae5f51df21fbb4f1a6f429088c923a7681f7a3

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