Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5a79ec7e0c1103…

MALICIOUS

PDF

81.5 KB Created: 2021-03-05 05:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3debe753511010a612e3b62b0dc7e9b2 SHA-1: df61f340a986b918644ec5e3adcb1f4c8e210b7f SHA-256: db5a79ec7e0c1103c4942ca33fec9ebcd5d7662f5524b988c31df487df9e7d70
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains a title related to dental hygiene, likely used as a lure to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://gimoguvi.ru/123?utm_term=why+do+i+have+black+stuff+in+between+my+teeth PDF link annotation
    • https://cdn.sqhk.co/vefoxewijuja/ec6n8n3/99207490185.pdfIn PDF document text
    • http://forsage.pw/vaxilemox2gvwl.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/8426870.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/iejithj/47787761637.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/b4EibzK/tugugegif.pdfIn PDF document text
    • https://cdn.sqhk.co/bupusudiva/h0igkia/90720557978.pdfIn PDF document text
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/vojumemuwi.pdfIn PDF document text
    • http://istra-backwater.ru/caperucita_roja_cuento_completo_originalttp7i.pdfIn PDF document text
    • https://pisesiwez.weebly.com/uploads/1/3/1/4/131453260/fagev.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/Zibgfid/first_strike_final_hour_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/Hgiijhd/surmount_obstacles_meaning_in_tamil.pdfIn PDF document text
    • http://shoppingyxplus.xyz/accounts_payable_aging_report_quickbooksbm9vz.pdfIn PDF document text
    • http://trysalon.xyz/gilovuzasedirogujosafosu1fpqj.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/iohgo0I/zamiradozik.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/hb3zOFl/famizazogotabumiwujafe.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/Y5djdgi/bhop_pro_online.pdfIn PDF document text
    • https://zumizosapozogem.weebly.com/uploads/1/3/2/6/132681504/669002.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/fExShbr/napikufifijumokusosomit.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/biheKji/65190883052.pdfIn PDF document text
    • http://wide-do.top/tadademepisilabazistbo4.pdfIn PDF document text
    • https://cdn.sqhk.co/jinokazif/ajdM3hg/walking_dead_first_zombie_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/e3enFhE/vosirorodu.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/f5Nu8gc/pabejozonugevupazusom.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/Jtkig5U/napetatikomor.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/9939303d-dcf5-4fbe-a79b-263a8030587f/samsung_7_series_65_mu7000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d606e69e-ab8d-44e7-8593-26e881fcc99a/zivikukinote.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_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 5636 bytes
SHA-256: 369aa97fe574ce062b31ac21cf683496a4923b52eb26b293feb4bb133c4553c7
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 10544 bytes
SHA-256: a523e568103c658fb630e431e90a08c9e3f078a3a22e8317e6112a0c0f693fff