Malicious PDF — malware analysis report

Static analysis result for SHA-256 8663db306297830c…

MALICIOUS

PDF

94.0 KB Created: 2021-06-01 21:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: af9c680e4a0f120c65624f3e9aa77058 SHA-1: 916e43a024d619893d50aecc83e76e1b5536b991 SHA-256: 8663db306297830cf711b41263985b764cf9b36a75c1c5a3e3eefd09f66770cd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, suggesting it functions as a link farm or SEO spam document designed to redirect users to potentially harmful websites. The document body is heavily obfuscated and appears to be a lure related to 'Best manual post hole digger for rocky soil'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=best+manual+post+hole+digger+for+rocky+soil PDF link annotation
    • https://xorataseturife.weebly.com/uploads/1/3/5/3/135333409/4825aa59b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_606cbabcce285.pdfIn PDF document text
    • https://tojipojewusaw.weebly.com/uploads/1/3/0/8/130814735/0b28a2ec14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_601219d41afe5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391317/normal_6008f0dc2cec5.pdfIn PDF document text
    • https://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/bomolidixoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_600a271629754.pdfIn PDF document text
    • https://bisofojud.weebly.com/uploads/1/3/1/6/131607445/7021794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_6039478720d35.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/637917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf81b638-8225-4976-9b16-b0494c320d49/mind_power_study_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a280cb-cc10-446a-8380-d5855f589928/why_is_my_electrolux_ice_maker_not_working.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/w/file/fetch/144471615/opd_oxford_picture_dictionary_free_download.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/f/5_snf_ingilizce_retmen_klavuz_kitab_indir_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f38c31-0ab0-4848-997d-3f829ee721e0/lizizasobogivubonabiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e195ed0-5010-4c40-bb9b-f495a2dc8df0/nubiraz.pdfIn PDF document text
    • http://kalunagepigi.pbworks.com/w/file/fetch/144425433/hotel_housekeeping_checklist_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5e881e-1562-43ee-88ed-8b613059678b/ladimezogupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c81d8c6-5efa-4038-84f4-d2e7ba74a592/zuximokedefivetisejali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed404e4a-d51d-4f35-9b57-03364e71aecf/66558801892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d68180d-3c60-486d-afd8-602324b70fdd/cant_stop_wont_stop_nyx_concealer_shades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae1f928-a016-4ee1-ba66-22a3aabba0b7/xerojerizozumetumibalo.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_off000132c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C7 5784 bytes
SHA-256: d4aa417696b3f694d02ae821a864bb361f2eb35526441ae1bd85c3a7258badb5
font_01_sfnt_off00014657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14657 10760 bytes
SHA-256: 815a1225538ff6047e1445c84486573fc65b1c5a7ba4a5aee9af00fc18f47644