Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15715645f5944da…

MALICIOUS

PDF

73.7 KB Created: 2020-12-21 22:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3b788d7636dfa51fa865ca5fd0454624 SHA-1: 7b3334226857995d8c88501f57beb96faddb9ee5 SHA-256: a15715645f5944da7da3193054ba7d14daac119aea9c132e6c82340c3ca1e384
244 Risk Score

Malware Insights

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

The PDF file contains multiple links, including one that redirects to a URL containing 'kik.+us+app+download+for+android', suggesting a phishing attempt to trick users into downloading a malicious application. The presence of a large number of external PDF links on disposable hosting indicates a link farm designed to distribute malicious content or engage in SEO manipulation for malicious purposes. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

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
  • 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://cctraff.ru/strik?utm_term=kik.+us+app+download+for+android In PDF document text
    • https://sulogifobib.weebly.com/uploads/1/3/5/3/135322722/lubezuxajit_feregufa_kekoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5f9da6d00e95f.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/diluno-juvujokeduwu-linidenod-bunazunurepor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483337/normal_5fc2ad4c7838d.pdfIn PDF document text
    • https://daxefumusadaja.weebly.com/uploads/1/3/4/7/134763928/wadusaduma-leteba-vilisizib-dafegak.pdfIn PDF document text
    • https://dedutosaku.weebly.com/uploads/1/3/4/8/134852257/tikob-mebizi-gogired.pdfIn PDF document text
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/kodot.pdfIn PDF document text
    • https://jiwanozote.weebly.com/uploads/1/3/4/3/134354006/8167851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/neviwove/64943369199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013a9dac-e0c4-4480-b4a0-e4281b125af8/seacoast_news_maine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980659bb-54f9-4f5c-acdd-49b09443c12e/81528005344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca33105-bc3f-4a01-a216-03dbdfaa8593/sonod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24df90b0-c64f-480e-9310-86ffea616ca3/dubawinesawuvukinibewub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6630d456-be0e-4b7f-82b0-fb47c9d3a2bb/sonaxukegodomadurixison.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 4876 bytes
SHA-256: c5442a50a4df58660baf99feffad856738664492439ef4860215236e1dcd1eae
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 10400 bytes
SHA-256: cfa5e1f217f3643b358ce57017cfb00aeed33963cd4e3257764bf7abfdc5a8b6
font_02_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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