Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce659f91d9bff73d…

MALICIOUS

PDF

76.9 KB Created: 2021-01-21 11:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1c7edb7150d735c1cf7d29e3d331dcf2 SHA-1: ca8175cf78b97455b0ed3610771d6461e470a850 SHA-256: ce659f91d9bff73d8b1ce4f3e64d1379980f284ebc7ce351cd90d250d153d7ae
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily corrupted, contains text related to a salary schedule, which is likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=alameda+unified+school+district+teacher+salary+schedule PDF link annotation
    • https://tijozamuworibop.weebly.com/uploads/1/3/1/6/131607374/jaruzuwe_lovez.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/MC8hiPW/24969019796.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/pwiiiEV/monobipozuniziseta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ff653466bc54.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/gMiageX/dop_draw_one_part_level_56.pdfIn PDF document text
    • https://cdn.sqhk.co/panosiritu/whgEid5/dunabavijogutevuwekuseveg.pdfIn PDF document text
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/xogegodubekafob-noxawukap-digeb-vadolotura.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/decde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_6007e8d291adb.pdfIn PDF document text
    • https://misadedami.weebly.com/uploads/1/3/3/9/133997414/7949754.pdfIn PDF document text
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/vuberogurol-lavon.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://s3.amazonaws.com/xasovewipeje/library_of_alexandria.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/36300115074.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/bullguard_antivirus_mac_free.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_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 5232 bytes
SHA-256: 4f95e8154127617b485b6ac181109e7a95f99c6513cc0e2e840892f2708eecfc
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10864 bytes
SHA-256: 6f4dc3a757d2f5c822ab274ce51ad10792645e39360f2e88984374d0bbe0e730
font_02_sfnt_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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