Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9ccdabd388206d…

MALICIOUS

PDF

76.5 KB Created: 2021-03-31 01:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6316f5bfa51f71e97229a788f5b32091 SHA-1: 923c2f5c897343883e13b50c982435fdc9f134dc SHA-256: af9ccdabd388206d9ca9416073a7aca80de2f1c0aa0d58578f5056d23e7d3d41
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and embedded links pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest this PDF is designed to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/wix?keyword=feliz+cumplea%25C3%25B1os+amor+de+mi+vida+frases+largas PDF link annotation
    • http://rerolakareruxom.22web.org/66410497990.pdfIn PDF document text
    • http://keepsufi.space/fekukubolevobafokifuxiwu19lys.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_6047db1605079.pdfIn PDF document text
    • http://getcabinets.xyz/zofujalijasefxjgg.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/como_aprender_espanhol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_6010138f96713.pdfIn PDF document text
    • http://bobejitamatu.iblogger.org/45562569137.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/vutalidofaxetegadimupipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481406/normal_60038d896ff0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_604d758f0bd66.pdfIn PDF document text
    • http://ilkertr.shop/56551796412q5cb0.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/has_any_prophet_seen_allah.pdfIn PDF document text
    • http://risatixedigati.22web.org/low_back_strain_stretches.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/genedesowul/nevonikegodar.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/15002828202.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/anthem_pc_demo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bab1260-67b8-4f31-bb46-ce1fdb76b522/honeywell_th5110d1022_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edf424e-1bf3-4095-8320-6d49322a125d/how_to_make_medical_face_mask_at_home_easy.pdfIn PDF document text
    • http://rabelame.atwebpages.com/42964634486.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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 5752 bytes
SHA-256: 32a5bffdd069d4bb201c87a752cdec42ed73a3cc24315a5d59a9b553295e88b1
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 11300 bytes
SHA-256: a99b50233cfd93766446cf59971bb76b9b8f8c0d0c65450a860b8afb3be10b3a

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