Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7946408f15528f3…

MALICIOUS

PDF

69.8 KB Created: 2021-02-12 17:33:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2ef0e75c850885d733419731b779e232 SHA-1: 02c0048a62bed41c2dc1400546cc96fc8f329dce SHA-256: a7946408f15528f33a6e36b0ece0ea8be121faae15849bfea2e2f5bbe719c4fc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or low-reputation. This behavior is consistent with a link farm designed for SEO manipulation or to distribute further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=a%20level%20further%20maths%20notes%20pdf PDF link annotation
    • http://mishabelle.ru/vemesegv67.pdfIn PDF document text
    • http://lovepositions.info/jotajowamef6xee.pdfIn PDF document text
    • http://lavka-karamel.ru/biguanides_davispdniy.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/ggjeGgj/wifonotorilibijoka.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/5Z6Nwhf/rixebidesalo.pdfIn PDF document text
    • https://ladujeka.weebly.com/uploads/1/3/0/9/130969399/lilujotoreremaz-mafis-baxugisudunuro.pdfIn PDF document text
    • http://b4shop.icu/bunosavinatasewaibnl.pdfIn PDF document text
    • http://qwertyujg.xyz/tasugakikanolol1remt.pdfIn PDF document text
    • https://jipenudus.weebly.com/uploads/1/3/1/4/131406532/zusevodiropijoserux.pdfIn PDF document text
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/1112797.pdfIn PDF document text
    • https://zulunapakaf.weebly.com/uploads/1/3/1/0/131070820/ranirixokalevevu.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/5d5d06948879b3.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/8702465.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/vuritumukejuge9er0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 5332 bytes
SHA-256: a93b9487047d0423f5d1d4434999312390e7331125b46944b17453f3121a6ae1
font_01_sfnt_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 10940 bytes
SHA-256: c2951c1e43c22714de0d8b3092648c7094430ebc7438454e78ffda811c8060cc

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