Malicious PDF — malware analysis report

Static analysis result for SHA-256 7371dae776c1c6a8…

MALICIOUS

PDF

75.1 KB Created: 2021-05-10 16:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0e9988a63c53eade7f03c5add6e42ecf SHA-1: ead910e3967eb00f663abb9eb7cc05f3ad39acf0 SHA-256: 7371dae776c1c6a88107ec3efbebbe9d4557ee5bbaf18cc6c4ea73349becbf02
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous external URLs indicates an attempt to redirect users to potentially malicious or unwanted content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/strik?utm_term=brother+2270dw+print+test+page PDF link annotation
    • http://mapugukabazewu.scienceontheweb.net/bsc_interior_design_salary_in_dubai.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/jiAuLXe/25533092541.pdfIn PDF document text
    • https://sinidakebe.weebly.com/uploads/1/3/4/5/134591073/niboxurutiwufozudir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465390/normal_5febcd1a70404.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/VO3Riid/super_wings_jett_run_apk_mod.pdfIn PDF document text
    • https://degadita.weebly.com/uploads/1/3/5/9/135965793/pujuvez.pdfIn PDF document text
    • https://cdn.sqhk.co/xovenekot/egcljcG/meteor_shower_august_2020_south_africa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fcfa2c6bea5e.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/sakipeguwoge.pdfIn PDF document text
    • https://jesomufufasak.weebly.com/uploads/1/3/1/8/131872286/1baee4af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_dab3f9f0612047a1a94dee5f2b3f4422.pdf?index=trueIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/pumigazuzamuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17a201d-10ad-4574-9033-251e2ce59840/how_to_scan_multiple_pages_epson_et_3750.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_e0c6896d4bd744068523c6b5d50e38df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2110bb4-7b09-4f4d-ac61-46a0a0112f5c/miwisoxarifomajikov.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_bea1529022604465a0a1036a971dadf9.pdf?index=trueIn 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_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 5684 bytes
SHA-256: 28502f0d74616ad4a8e58aea1d2a497046f8e193930e54fe0b848dcaeac76b81
font_01_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10732 bytes
SHA-256: c29a460242d8f7799d40b86ba546893808ac49fb1a124c6ba101bfa67f230f3c

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