Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20cf45b57de718c…

MALICIOUS

PDF

83.0 KB Created: 2020-12-05 01:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: da07730520ec8a67f7a644fde33349e9 SHA-1: dc25234c4e807cedf57e9c9fd749e537906d5546 SHA-256: e20cf45b57de718cef2ca548c7258fea14c5fae5e9396da1012f9db57e976ca9
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and link farms. The heuristic firings indicate the document is designed as a link farm, likely to manipulate search engine results or distribute malware. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://ggtraff.ru/123?utm_term=helen+harris+bridesmaids+house In PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/varowove-misixasidav.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/502c889135836f0.pdfIn PDF document text
    • https://litulivugaz.weebly.com/uploads/1/3/4/4/134463412/1540246.pdfIn PDF document text
    • https://gupupekulumo.weebly.com/uploads/1/3/4/1/134108922/d8130ddd.pdfIn PDF document text
    • https://zagarete.weebly.com/uploads/1/3/4/6/134687236/gavomilifi.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/02908ad7b0dc.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/2884373.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/9253690.pdfIn PDF document text
    • https://detagugijubofex.weebly.com/uploads/1/3/4/3/134365812/7615517.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7aa7ca-c9f3-42af-b599-3590f0eb54e6/90106880915.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc109f45e8e827d428e9438/t/5fc61f759d793648405e4a9a/1606819703855/redawuviwimagiwiluf.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/kuwedejikekomav.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a0a9579eee3ae06ee35c/t/5fc9fd6f6a94db17e495770f/1607073136356/download_the_blockheads_mod_apk_1._7._4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6002c17-3de2-4a4c-a303-d8c61e5845fb/wow_vanilla_healing_addons.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_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 5168 bytes
SHA-256: d6c9c2085d4458a0a3fbbc7167fea2396ab8b7628f8f6f633f91cb25ab8a8bec
font_01_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 11484 bytes
SHA-256: 1b37271473466993b75cef5f3d39a6c558effccfa23c55a2fd1e5c4fc21eadcb

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