Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17b6843a846e3b…

MALICIOUS

PDF

125.4 KB Created: 2021-03-03 09:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3244f7a078f53de042c66de6322e3e43 SHA-1: 94039c58f1241e3da6c4ad2b97c272cb26b8f7b5 SHA-256: cd17b6843a846e3b20ca20be56710a1a56acf14e176f4c83764848ba678dbc38
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many pointing to disposable hosting services and redirectors, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The document body itself is heavily obfuscated and contains metadata that does not align with typical user-facing content.

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://crophysi.ru/strik?utm_term=timex+ironman+global+trainer+gps+software In PDF document text
    • https://feredelulewijun.weebly.com/uploads/1/3/2/6/132681536/0bc097.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/jeihYjc/zozinoruwumurov.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/7hDigUw/58939341304.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/bs8hjhb/risoli.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/2126600.pdfIn PDF document text
    • https://buvupoxiku.weebly.com/uploads/1/3/4/3/134329971/ritovuwifetuj.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/Xgi6ib2/tuwobapevojigif.pdfIn PDF document text
    • https://cdn.sqhk.co/wamitavixitu/jeii610/zuxeniw.pdfIn PDF document text
    • https://jinuwipalo.weebly.com/uploads/1/3/5/3/135332432/wanonebexidipa-pugexafavoj-wigidexejareki.pdfIn PDF document text
    • https://giberala.weebly.com/uploads/1/3/5/3/135306284/8880000.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/mixebalo-vutekojot-xuzeja.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/RjfhdG8/dumevef.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/4404796.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/zirapa_kapatesujuzen_vefupefabewere_wegijavu.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/dixaleko/fisutemogubak.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/twitch_app_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/percussion_instruments_definition.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001962c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1962C 5468 bytes
SHA-256: 417c0d025ecdb053856b60f04842f4b34993a40f87560bd85f4f9ab21866f92e
font_01_sfnt_off0001a8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C3 12844 bytes
SHA-256: 9e50fb47ba3725134dda1eb898d9ce1fad05dc4b9e43d4d7b0ad14f32bcc96b4
font_02_sfnt_off0001d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1D2 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939