Malicious PDF — malware analysis report

Static analysis result for SHA-256 61dd7da5fc03df5c…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 01:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a6e6189b237f484ef668bcfbe71eaa27 SHA-1: 6b8825c2dfd428c6c1592ac7e7ec7035c5b79b7d SHA-256: 61dd7da5fc03df5c999e02ef4c77ddb0dcfd40d384b95a2c8189d673af3a4acd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDFs, many hosted on disposable domains or using URL shorteners, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked resources. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=ffxiv+squadron+enlistment+manual PDF link annotation
    • http://jijufopofe.iblogger.org/bedawogaremokupa.pdfIn PDF document text
    • http://greatholl.com/liwawejagorikerozcpv.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/eghaAfC/32660896082.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/jchdYje/bikarifilufomeva.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/1935623.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/igOHLjg/92082510293.pdfIn PDF document text
    • https://venevivoxeda.weebly.com/uploads/1/3/1/8/131857756/jerirozenemadodir.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/lisil_kopewelese_bezuginigawi_fazofomegined.pdfIn PDF document text
    • https://cdn.sqhk.co/wafudovop/jf9jicK/xovadugediwogutilomimole.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/hgjeije/free_wallpapers_for_samsung_a20e.pdfIn PDF document text
    • http://podipotekoi.ru/what_are_the_5_major_philosophies_of_education0vo9f.pdfIn PDF document text
    • https://cdn.sqhk.co/kobamebexog/PjdCKjj/nature_pokemon_let_s_go_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/YihEgc9/souq._com_amazon_global_store.pdfIn PDF document text
    • https://veselamo.weebly.com/uploads/1/3/1/4/131452803/bufej-fexuxorefanegi-fofebanamod-jipigi.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/aichhjf/pomuzuriforirasuzaluteva.pdfIn PDF document text
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/495687d6b.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/selabafeb_fakewimi.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/aUhaEt9/50066320016.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/9vjix3j/xerulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezadup.rf.gd/jukibagemiwofa.pdfIn PDF document text
    • http://ravigokabuf.rf.gd/pictionary_rules_mattel.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_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 5264 bytes
SHA-256: 8c2e6e06045becb50e1f96ad6a7e9bde6d7beb7aa9156265ccd6e3d2ad2da23b
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 10432 bytes
SHA-256: c9b9602586addce40b1e28a87dc9b2f773a2b58d18041144c7ac401dedc0b2e7