Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7f71a895a748af…

MALICIOUS

PDF

74.6 KB Created: 2021-02-12 16:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: afef164d7685cbdedb863a3801edd1d2 SHA-1: e22b86b573e89f4bdc06d5ae66f45ee89fa6275a SHA-256: 3a7f71a895a748afddfacfdd9a4ec750567ee963d0ce45a8dc9ffc3e44ce22be
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=skyrim+reset+house+cell In PDF document text
    • http://veronaital.space/gopometonafwnqok.pdfIn PDF document text
    • http://astropsychology.site/mewagaxojakidinonexjdb1.pdfIn PDF document text
    • http://osthondroz.com/24443645085x3qzk.pdfIn PDF document text
    • http://nanolenka.xyz/video_4k_androidzrwr5.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/8571520.pdfIn PDF document text
    • https://zejenabo.weebly.com/uploads/1/3/0/9/130969472/b02ba1e7ca6.pdfIn PDF document text
    • http://imm-shoes2.club/started_when_we_were_younger_you_were_my0iaq5.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/nekigixutabazowirimodigafcl0p.pdfIn PDF document text
    • http://keep-travel.com/bipalephfkpv.pdfIn PDF document text
    • http://reduslim-ufficiale.website/talamuxulupotoparukam1mbx.pdfIn PDF document text
    • http://giocodigital.space/18057500896n26km.pdfIn PDF document text
    • http://wbigs.space/meme_hub_introa905v.pdfIn PDF document text
    • http://itrom.fun/keep_any_promise0m2ht.pdfIn PDF document text
    • http://amsidgi.xyz/90587356753cuw2f.pdfIn PDF document text
    • https://cdn.sqhk.co/gajeneset/h8wfVxQ/27329605729.pdfIn PDF document text
    • http://coolvdomaion.online/lost_temple_location_botwp8m13.pdfIn PDF document text
    • http://lifeshop.pro/3509569522215siw.pdfIn PDF document text
    • http://republvinb.fun/vlookup_and_hlookup_formulag0wni.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_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 5100 bytes
SHA-256: 9daf1c3e05322c2149cc5df462535b87fb778c7ddb3df50ef2f47f17da2858ab
font_01_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 10612 bytes
SHA-256: 2a042b95a8aebdc098c0cb66ab3a8dff1bbc32ad5091a47d302c0c61f766e647

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