Malicious PDF — malware analysis report

Static analysis result for SHA-256 652697cdc31d06bd…

MALICIOUS

PDF

74.1 KB Created: 2021-03-05 08:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: abccf1e6ccec2572186963875b2ccf01 SHA-1: 68656425e30a8a57230d75dfa33fe1ec1d01272c SHA-256: 652697cdc31d06bdf2babc1a63f2410f8a5ba533d5226b3ee6ac626eba4f52b4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to various external websites, many of which are hosted on disposable or suspicious domains. This behavior is indicative of a link farm or phishing campaign designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://jumiwimov.ru/award?keyword=how+to+crochet+a+slouchy+beanie+easy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5fe2987f8a20a.pdfIn PDF document text
    • http://tojubilabesi.22web.org/95285050436.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/hbLHAXp/block_tank_wars_2_premium_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/czbZjh8/rolatomi.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/5c3cd838caa6.pdfIn PDF document text
    • https://cdn.sqhk.co/baziwuwe/V0ge4uF/zewib.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/giaic8b/simple_tiny_small_eq_kb.pdfIn PDF document text
    • http://vafijevimam.iblogger.org/11215295307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_6033a5efeea99.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/nimuvak_bofimememitex_gadid_ropavizagibi.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/WgjEgZS/dictador_20_year_solera_rum.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/Bhvjf9a/baby_bumblebee_kids_songs_youtube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://migepelulu.epizy.com/56256495607.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/17185070527.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/ruriwovaz.pdfIn PDF document text
    • http://disobaratid.rf.gd/75495286643.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/98916041375.pdfIn PDF document text
    • http://vixezazemezox.epizy.com/18207665972.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_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 5180 bytes
SHA-256: ad130749ad2a3ea2550c60f90f8d33bd38f8a79105c6211e9b33e3ada510ec8a
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 10380 bytes
SHA-256: 79d6ad71186f83159e9b7da4401a13319457c3466d6ea568a901e3897835bb46

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