Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5d1e7742520a53…

MALICIOUS

PDF

82.3 KB Created: 2021-05-09 18:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5dbd0339bf5ac03eaea3451762f111e5 SHA-1: b3aed770518c65dcffe2843cda45791072ffd180 SHA-256: 5d5d1e7742520a53d3d5c4fee50b93344f88b8b3fb8d5ad3e40a5c6a4defb8a5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/strik?utm_term=the+great+gatsby+chapter+1+quotes+about+jordan PDF link annotation
    • http://tiktoktop.design/siluduledouph2w.pdfIn PDF document text
    • http://ledabojuvogo.22web.org/vojudi.pdfIn PDF document text
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/9f05d5bd325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5ff9a3f5019ec.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/2583166.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/rovuxatisurezanif.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/bumimiseve.pdfIn PDF document text
    • http://biomaniix.website/can_a_protest_be_peacefulcyywy.pdfIn PDF document text
    • http://pubolovuwete.iblogger.org/charlotte_tilbury_magic_foundation_shade_guide.pdfIn PDF document text
    • https://patakobenidirok.weebly.com/uploads/1/3/0/7/130775678/kesumix.pdfIn PDF document text
    • http://hotita.fun/20062215483egda7.pdfIn PDF document text
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/notuzavuk_febumabivag_wuzavoxodo_laner.pdfIn PDF document text
    • http://limaxinsto.xyz/16621914489m0jxn.pdfIn PDF document text
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/leditetafomisi-fimerokasapek.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/2406283.pdfIn PDF document text
    • https://gitiritibew.weebly.com/uploads/1/3/1/4/131483488/wazibed_pazikuf_rifojela_ravex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaponabugati.epizy.com/joxijefivepoxebiwexor.pdfIn PDF document text
    • http://makeromevoju.rf.gd/ap_language_and_composition_sample_multiple_choice_questions.pdfIn PDF document text
    • http://sebipukavore.epizy.com/74656310891.pdfIn PDF document text
    • http://joxamemi.epizy.com/medizojepi.pdfIn PDF document text
    • http://valodabopovox.rf.gd/gosomedirizugugikorox.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_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 5748 bytes
SHA-256: 3c1e234ebe029565614338e775011808df1aee4c3a42a0a95e6f156c650f9795
font_01_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 10468 bytes
SHA-256: 291d14389edc02d9077eb594bbbe634c45576ce23bce1782031b461699e30a56

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