Malicious PDF — malware analysis report

Static analysis result for SHA-256 899c180e86e8f891…

MALICIOUS

PDF

71.9 KB Created: 2021-02-15 23:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 80cd93be40b9c2d0c53db3410f615756 SHA-1: 68f0ce30f5a5b4e3eb768ca87f269a6e22e45c8d SHA-256: 899c180e86e8f891e901d4eab9f15540a5078ff72bc0625c405c5be5c50af030
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many hosted on disposable domains, characteristic of a link farm or SEO scam. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically flagging it as a phishing trojan. The embedded content, though partially garbled, includes references to 'Conjunciones en español' and the wkhtmltopdf tool, suggesting a deceptive lure to drive traffic to malicious or scam-related websites.

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
  • 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://jottigo.ru/wix?keyword=conjunciones+en+espa%25C3%25B1ol PDF link annotation
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/2934639.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/Mwihhff/gulupotaxeboxagexozazis.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/dMiccei/love_letters_in_the_sand_pat_boone_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/Czhd8Tv/shiny_shell_car_wash_murray_utah.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/fWjgicR/wapifanopezasub.pdfIn PDF document text
    • https://najunewuzerus.weebly.com/uploads/1/3/1/4/131408250/beleg.pdfIn PDF document text
    • https://wutejaguruloz.weebly.com/uploads/1/3/1/8/131871665/vunalifanu-kofatukojo.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/jcibEzj/yellow_fins_surgery.pdfIn PDF document text
    • https://gipudakewisuvu.weebly.com/uploads/1/3/4/6/134665668/lepuxaxu.pdfIn PDF document text
    • https://wazexusevawixi.weebly.com/uploads/1/3/0/7/130776334/nisirafen.pdfIn PDF document text
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/sukidelajawes.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/bokelur/chomsky_normal_form_remove_epsilon.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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 5024 bytes
SHA-256: d757614685d810ebed0a52268913bfb4a0fd8d77b2e174ce09f83765a96f6417
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 11180 bytes
SHA-256: d02ca717af9275ad4af93517c40ca6a5ab4432dc13be0844ffd79c69fd1dff2a

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