Malicious PDF — malware analysis report

Static analysis result for SHA-256 36436bfdc60b9604…

MALICIOUS

PDF

77.0 KB Created: 2021-04-01 18:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b6285e7d4e3bbdcffb73f306f1d15204 SHA-1: 8bed11225cab54bfcfe7512ae4f700d971f0d9eb SHA-256: 36436bfdc60b9604593c48156e8ce736cb7eb92799ad94a9f85d4ebe78872fd9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=is+the+lg+g+pad+a+phone PDF link annotation
    • https://sulogifobib.weebly.com/uploads/1/3/5/3/135322722/simatipod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502246/normal_5fd3d32ce43cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_604400bef3bc5.pdfIn PDF document text
    • http://detomebokiv.iblogger.org/how_to_use_kobalt_portable_air_compressor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_6065a34c88dfa.pdfIn PDF document text
    • https://cdn.sqhk.co/mewoveri/wig8gfw/defefudi.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/97821009950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_5ffe41f409bb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367621/normal_6003d0ab11e32.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/bixolaxepala.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/gd7jibI/lynx_lake_lodge_presque_isle_wi.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/eeYhjb6/begging_you_tik_tok_song.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/e47640f3-7225-4d2a-93e7-29595233674e/hp_laserjet_4200_roller_kit.pdfIn PDF document text
    • http://sepisug.rf.gd/xobaxadanisemod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57cc3497-7554-4cf2-9d59-e2de334421e9/how_to_fix_a_pressure_washer_hose.pdfIn PDF document text
    • http://vipesuno.rf.gd/bovorejox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a8ce8f-4a11-4aac-9144-38748b0c8b8c/68248753652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0deb8fed-24f1-4253-bd37-abbcceebf7f3/fidekexetixizupugazofana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44debce8-aa58-4ff1-a9bf-c916b73d3d82/oracle_sql_concat_2_columns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1bf432-6e22-4bbf-b029-c84b7cae62e9/does_nora_kill_herself_in_a_dolls_house.pdfIn PDF document text
    • http://wibekemuxeni.epizy.com/mufasezebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf08a3f-2036-4c65-af94-ec93d7ffa0f7/56138560592.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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5060 bytes
SHA-256: db8849296603573b335dd46cee2f600459f8180692f156938a33af20f7167551
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 11772 bytes
SHA-256: 149d5979cd653bb1632c0277c3911e9015829d8e408c698229a1686b2df42d69

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