Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb31bd66851d3f00…

MALICIOUS

PDF

79.0 KB Created: 2021-03-11 13:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ba000d482291a5989d03b723106db360 SHA-1: a0190a5fc1c32a636d42cf2397a04cfda1af51d5 SHA-256: fb31bd66851d3f007bfc11f764f88e86255f149c03159bf84354dc7b03f536d7
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or spam distribution tactic. The document body, though heavily obfuscated, contains text related to browsing history, likely a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection, strongly indicates malicious intent. No scripts were extracted, but the overall structure points to a phishing or content distribution scheme.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dugedepap.ru/aws?utm_term=how+to+see+old+browsing+history PDF link annotation
    • https://cdn.sqhk.co/bajilevone/ibR71ef/96299694203.pdfIn PDF document text
    • http://nejomuwixeve.iblogger.org/beowulf_modern_english.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/gutegewiwoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/gezewakofi/heIxH3E/94404056921.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/4209858.pdfIn PDF document text
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/2029cd6b2c47.pdfIn PDF document text
    • https://dejokorakas.weebly.com/uploads/1/3/1/3/131379117/bosuz-pamipuzanix-gebepivimazedan-sutepobuvawut.pdfIn PDF document text
    • https://terulupi.weebly.com/uploads/1/3/1/4/131406892/pexonifa-lonejaragoge.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/zmjfYs5/telekom_malaysia_berhad_annual_report_2015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/91778210-9559-4336-97ef-0b76ae6a41a4/ditokikidakujovofu.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/browsec_extension_for_mozilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157e3d63-292c-402a-a42e-2281f14782e4/zimusesokufizusixivubeko.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_50d07d84b8b540c08f1005dd7cb5348f.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_0b451c6d070d49d488927734ae8c78f3.pdf?index=trueIn PDF document text
    • http://nifuwisenomu.epizy.com/coriolis_flow_meter_principle.pdfIn PDF document text
    • http://rawobebisef.epizy.com/how_to_use_hand_pallet_truck.pdfIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_99fa0cad906249b6956bf0ae4c24847a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/brother_mfc-7860dw_driver_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/77571399680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce94742e-b769-4896-a19e-ff6ee77ce25d/18976767096.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 4960 bytes
SHA-256: 4cca381833e26d458e980b686860b409c1e24798992766a0cbbaad4b85201c1e
font_01_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 10208 bytes
SHA-256: 0868ecf8e90260905c94071a8906b524339641faf9c2198c3cc0148e0f9eb0a7
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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