Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fb693a1ff6778a…

MALICIOUS

PDF

80.5 KB Created: 2021-03-08 08:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7fe771438ede79b6f375ac11f6bbdf89 SHA-1: ac09fe7334a467424ce1054fdc5d96e3b60e0127 SHA-256: f8fb693a1ff6778a8c588268921d06792817edc4e5351eab1b42a83e32fa1271
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of external URIs and the structure point towards an attempt to trick users into downloading potentially harmful files or visiting malicious sites.

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://druttle.ru/strik?utm_term=lg+d415+firmware+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443342/normal_600ff33862497.pdfIn PDF document text
    • https://jinabotulopel.weebly.com/uploads/1/3/4/6/134602701/jiremefozekizabawem.pdfIn PDF document text
    • http://lazegegufezed.iblogger.org/xugupovefodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448549/normal_60126a3296987.pdfIn PDF document text
    • http://takodevizol.iblogger.org/cisco_2960_x_datasheet.pdfIn PDF document text
    • https://jerepubiz.weebly.com/uploads/1/3/1/6/131606505/120661.pdfIn PDF document text
    • http://rafewasugajeze.22web.org/45040715183.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/trane_xb80_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_603a2bfabebfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_5fdab9899a03c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5cace1-6345-4a75-a464-db1450307a55/sokizapop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1eae573-8cb3-488c-8683-88455b67ba9d/nufaxonofagadaxe.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_735e219ffcc442ecb19873febe9dbaf2.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_b6c14efbba004c5580c821b2246bcb96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd94f403-941b-4d1d-8ecc-ac3681a5f29b/2005_murano_starting_issues.pdfIn PDF document text
    • http://rimamosapike.epizy.com/bona_hardwood_floor_cleaner_msds_sheet.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_d67b8c092f6244d48701026e4772830d.pdf?index=trueIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/rifoxadik.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_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 5344 bytes
SHA-256: 51448203cf9ecd5537a44b97fe92fd4d16a32f1352f2a67f91a8e3f478194cbc
font_01_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 11144 bytes
SHA-256: 21aa7c99676d2913acbd1b5e281e974618fc73909cbe53f178c19c0d88dba23e

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