Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad9be1aaae642aa…

MALICIOUS

PDF

72.8 KB Created: 2021-02-18 13:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6c20a9a0df51da1458361ec356bd1b48 SHA-1: 736653a1c18e83785017059d32f15826014db327 SHA-256: aad9be1aaae642aafbdb25bb20a3ec9a63d28b9860a22adcef813dea3228740b
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves a malicious purpose. The presence of numerous external links, including a redirector to a known malicious domain, suggests the document is designed to lead users to harmful content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan delivery 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
  • 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 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.
  • 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/strik?utm_term=alice+walker+everyday+use+theme In PDF document text
    • https://tebudewuve.weebly.com/uploads/1/3/2/6/132683230/6490832.pdfIn PDF document text
    • http://stikc.xyz/beyonce_dangerously_in_love_freecw9ih.pdfIn PDF document text
    • http://sushibara.net/fundamentals_of_database_systems_7th45kns.pdfIn PDF document text
    • https://zafatuxowusetex.weebly.com/uploads/1/3/0/7/130739053/2ea90d433fc0c6.pdfIn PDF document text
    • http://mikrotikwizard.com/xelumusegexasulinugafz1vhh.pdfIn PDF document text
    • https://mapavafamaluri.weebly.com/uploads/1/3/5/9/135999294/6133508.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/hMhgD6N/lekudedepepafejeb.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/ggD6Ogh/police_moto_bike_prisoner_transport_3d_download.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/779fd817d485.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/a385f5.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/3563868.pdfIn PDF document text
    • http://shoop-fn.ru/fiwipiriwanibopobigvc0bu.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/ngiIifF/notes_in_spanish_podcast_3.pdfIn PDF document text
    • http://heartcenteredequestrian.com/pomalemagutezujiwuzikwswnu.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/jcjbTMJ/freeway_ford_service_bloomington_mn.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_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 5488 bytes
SHA-256: d706a574f106fb51ff5f5e72886c24acd6c44fd8a2bca208736af5fde3fe738b
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 10044 bytes
SHA-256: aab5e2973185dc612af76b35eb77eb3e7c9e1fe14dbd873763894376344ddae4

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