Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80a396d01e521da…

MALICIOUS

PDF

77.1 KB Created: 2021-02-25 18:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 69c1f21cdfb68cdec2664e5da074ba39 SHA-1: 5311704c4725f93c5510568947028ef206759d25 SHA-256: f80a396d01e521da5ef5d79967b5f624139e200cc7e337736385b8662bd902b3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of numerous links to disposable domains further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=bella+sara+codes+for+winged+horses In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_6032c12bcf8c6.pdfIn PDF document text
    • http://1cats.space/blank_calendar_jan_2019_templated2m01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_600fcd4179aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_6010758c2480e.pdfIn PDF document text
    • http://stavki-na-sport.site/55485173470hweli.pdfIn PDF document text
    • http://afracheat3.xyz/golonapefawudofarah2wdj.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/bhrSghR/50276658701.pdfIn PDF document text
    • http://mmmmmme.space/siruwe3f1oa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_601ac0fd93c05.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/clash_of_clans_th11_war_attack_strategy0skap.pdfIn PDF document text
    • http://soinjaga.ru/wowuviber9kkg.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/ij3jfhf/new_grandparent_gifts_etsy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_601c8bbb1a202.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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 5424 bytes
SHA-256: e74aab678b2271dafb8b6b945b437c390ae99bf9c6d9e7feab27e969c004380f
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 13724 bytes
SHA-256: 44472fec421d81e967fc6d0f703d46701aede86b8c30823427fdd2d70a40e4b8

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