Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99e39196cf69275…

MALICIOUS

PDF

79.8 KB Created: 2021-03-31 21:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17da894b27392ae158ff52dbe6ad4f0a SHA-1: 5ef5f358f59e6517d8b76b4d5371839b1250f406 SHA-256: d99e39196cf69275ee082a1e271bb1ab4e95edb68e6f4fba9e14d55506ff514c
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=describing+charts+vocabulary+pdf PDF link annotation
    • https://cdn.sqhk.co/pasivuzuke/tGhbQsH/2802264702.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/deie0gj/xubegamu.pdfIn PDF document text
    • http://zobebukore.22web.org/active_to_passive_exercises_b2.pdfIn PDF document text
    • http://rulakegigarapo.22web.org/71468374297.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/R0Ojcha/93065846442.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/iDhb0ZZ/fexisiwesufizapivapaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xudogafu/hHgdsH3/talking_ginger_2012_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/Qhegsjj/download_skyblock_for_minecraft_1._16._2.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/7ieqbje/17397473417.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/KRjbNtO/fallout_shelter_mr_handy_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vodugesivizere.epizy.com/bradford_white_hot_water_heater_service_manual.pdfIn PDF document text
    • http://jakukimokop.rf.gd/emotion_wheel_black_and_white.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_f35b53250b0740bbb3729151235f1621.pdf?index=trueIn PDF document text
    • http://vajexakatozezal.epizy.com/illuminator_casio_watch_manual.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_f3b4307f4b434026b328a7064e40de61.pdf?index=trueIn PDF document text
    • http://gapisoga.rf.gd/19869317856.pdfIn PDF document text
    • http://tivapatovike.epizy.com/kopavokatopotar.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_fae893f27d954184a2f7487bc78b39b6.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_7b1d032cdb504c1f9ba4aa551b8369c5.pdf?index=trueIn PDF document text
    • http://xepisejobawob.rf.gd/how_to_restart_a_sub-zero_refrigerator.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_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 5716 bytes
SHA-256: db11990be35a2c377739a34f27d292ab47450434ddb93eeb658ccaf784094ca4
font_01_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 11120 bytes
SHA-256: 7dd7fe53b41ac71f7a8bdfd63fb48e46c49fdea74f5c0b0a0ce6799e8510f08d

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