Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b1db5899f45817…

MALICIOUS

PDF

72.1 KB Created: 2021-02-09 19:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7c6900a6e44ec977373bdc29c44de9b5 SHA-1: 988101dc12b08f4ae185c491bb8786bcaf3543ee SHA-256: b3b1db5899f45817cbb819f5eae33203d06545ca91d41dc037b8ec6ec1a3ae7c
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/123?utm_term=what+is+clean+cut+pizza In PDF document text
    • https://cdn.sqhk.co/mexovaru/jieVhbk/who_is_christian_grey_based_on.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fffd84b248a6.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/heijgg1/zejejudapuxiv.pdfIn PDF document text
    • https://tupetipu.weebly.com/uploads/1/3/4/4/134489263/felemix.pdfIn PDF document text
    • https://xuvamifete.weebly.com/uploads/1/3/0/8/130874567/lafijokasafajigol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5ff01b4f653d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380540/normal_5feef4138d975.pdfIn PDF document text
    • https://cdn.sqhk.co/rigepasemapa/9IVhgil/skinstore_discount_code_2020.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/zazomonitagop-xakaf-melol.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/kjhKltO/48328929632.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/xgjZjad/free_calendar_october_2020_template.pdfIn PDF document text
    • https://maraliva.weebly.com/uploads/1/3/2/7/132712127/bitaxunupijit_xirunowit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492574/normal_5ff859a230567.pdfIn PDF document text
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/833049.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/zakunafu/salesforce_lightning_reports_vs_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/55252510907.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/emulator_android_paling_ringan_untuk_whatsapp.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/34203389026.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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 4988 bytes
SHA-256: e68c565805f63c085f87779949460f28a5cd6ac1734afcb601cfb1a5aa76f55d
font_01_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 10304 bytes
SHA-256: cb49ae4754a124c8e9d6ccb3177aa64a4d8d4b59f82d48df915c81227a62d7da

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