Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75f2adc9b59e617…

MALICIOUS

PDF

65.8 KB Created: 2021-01-10 11:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: acb33fc5b082099300fb08069852202c SHA-1: 2c3705f65bac2a7ee299b568d1062607ab07fd7f SHA-256: c75f2adc9b59e617fe28924f5261187b4bbdc8b18d6886fac8c30117107f2fde
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, presenting a deceptive lure of a dictionary download while embedding numerous external links to other PDF documents hosted on various disposable domains. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=hinkhoj+dictionary++for+windows+7+offline PDF link annotation
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/fijidujepabamawaruso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fcb3ba760bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5fa50167ac738.pdfIn PDF document text
    • https://site-1171584.mozfiles.com/files/1171584/zuzogumemuxinikexajajudam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501962/normal_5fbd2a0ceb395.pdfIn PDF document text
    • https://site-1172855.mozfiles.com/files/1172855/xadaxowafugav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcd2f1574653.pdfIn PDF document text
    • https://nenarixu.weebly.com/uploads/1/3/4/8/134899789/d0ab68fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f8b9f1c6f9bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5fbcea6350f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fe6c206c5643.pdfIn PDF document text
    • https://jepupuwupojuv.weebly.com/uploads/1/3/4/4/134481076/4659351.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/pegozegi/infrared_spectroscopy_chemguide.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/iowa_state_football_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/gezafo.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_off0000c519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC519 5484 bytes
SHA-256: 45b93f21529da972865ac81113524653cb71d93a90d5aa53b2ffa743c58ee797
font_01_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 9964 bytes
SHA-256: cb6638f176d50b7d335a0530e79ca0d9ee53239a68800203c5f160a60fa16352

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