Malicious PDF — malware analysis report

Static analysis result for SHA-256 710d1fa1efafe6d9…

MALICIOUS

PDF

74.3 KB Created: 2021-02-24 16:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 37c68e3e678ece38f90d00e728201ec9 SHA-1: 9906c326e7dd3a50021a6962f144ff98da83cffe SHA-256: 710d1fa1efafe6d9b24e9e69610f5d7b4d1c773cb6448d8193f07ee0f932dfea
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 phishing operation. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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
  • 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://seumenha.ru/award?keyword=brother+hl-2270dw+printer+toner+reset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421781/normal_602d2ee083726.pdfIn PDF document text
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/fc57abe564f58da.pdfIn PDF document text
    • http://nutristrike-shop.ru/vizio_m65-c1_issues8rm2y.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/4860d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449419/normal_5fec53415d38e.pdfIn PDF document text
    • https://zekubetude.weebly.com/uploads/1/3/0/7/130738740/nofemojizikus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5ff493f8bef92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fc79767160b7.pdfIn PDF document text
    • http://republvinb.fun/mysql_last_insert_id_node_jsrvzdr.pdfIn PDF document text
    • http://forsage.pw/washington_state_unemployment_phone_number_for_questions7vk9x.pdfIn PDF document text
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/9050b3205c5f28e.pdfIn PDF document text
    • https://kokonasaza.weebly.com/uploads/1/3/1/6/131636703/zuridobubom.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/fikukeni.pdfIn PDF document text
    • http://yesitalia.fun/signing_naturally_ebookimxc8.pdfIn PDF document text
    • https://xofajusas.weebly.com/uploads/1/3/1/0/131069744/vosuvosazu-fugijoboju.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/fepovovesefewe.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/bojirulowifoso_jitonufano_tadorowit.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/rewepalazamiso/zilonunagabuf.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/87646165933.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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 5364 bytes
SHA-256: 4d27f4f4c51ed00163ff80ec2511f4c154af4b323fa379feaa5bd1eb5fe50318
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 10428 bytes
SHA-256: 78e260e625cd7c942e677dc4ef58e476cee26a8a9360e78b4061bdd6c6c5cb17

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