Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38effbdf4df05ef…

MALICIOUS

PDF

77.7 KB Created: 2021-04-10 08:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 155cb6af652f3d12ac78ebbed1c113fa SHA-1: e1a04ee0ad29a81d77a7f322eeae3f8596c65f5c SHA-256: a38effbdf4df05ef229e20d82fcb7cd89e903e66ecebf70e3631e1505728d208
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links suggests an attempt to redirect the user to a malicious site.

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
  • 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://zajinet.ru/strik?utm_term=2007+jeep+grand+cherokee+limited+lift+kit PDF link annotation
    • http://dsv-trening.ru/what_is_agile_methodology_in_development1vv58.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/fejeja.pdfIn PDF document text
    • http://osmosiotzs.fun/skyrim_alternate_start_guide4mrd2.pdfIn PDF document text
    • http://gta-msk.ru/pazarizazixue5xqj.pdfIn PDF document text
    • https://wukakokusaz.weebly.com/uploads/1/3/0/7/130739200/a3ffb604fa.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/robopanafosu.pdfIn PDF document text
    • https://kawotubizon.weebly.com/uploads/1/3/1/8/131871780/2c4626a8214e1b.pdfIn PDF document text
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/d1559.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/sakotusigo.pdfIn PDF document text
    • https://wixepivod.weebly.com/uploads/1/3/0/7/130775856/4404948.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/4135794.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/diwitapezu/ethiopia_reporter_news_amharic.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_abd3ba4d4f644a0e941124b223e837f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/steal_this_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c442c3f7-b90a-40f0-96b1-d8aae70e07d1/19134200341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c091e8-1473-4193-8411-6c4b52abe366/melhores_livros_para_jovens_de_18_anos.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_b478d9b4b388481b985a3d0e338f86f3.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_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 5792 bytes
SHA-256: 74d57c4bda2729402b6dd5af134a4eefe2c5b398a9a1c657d0efa6c870605a33
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 10488 bytes
SHA-256: 4e6185c334b07015edac51afa18db611850177288ab98260caa7298de79c1459

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