Malicious PDF — malware analysis report

Static analysis result for SHA-256 1841dffcaee96136…

MALICIOUS

PDF

74.3 KB Created: 2021-04-28 14:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f9b4f98dc118f9f57edacbbccb13780d SHA-1: aeb86329fff2474843e006a051f9b83f833c78a7 SHA-256: 1841dffcaee9613688d764b834b2c2831668620992b07b2907010647b2805901
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=asus+q550l+specs PDF link annotation
    • http://tokepubex.getenjoyment.net/ate_ve_su_3_kitap.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/45153215249.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/collection_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/goqhghg/damoropebesibuz.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/gghc0ig/diy_wooden_gun_cabinet_plans.pdfIn PDF document text
    • http://teladomejoxax.22web.org/calculus_12_textbook_nelson.pdfIn PDF document text
    • http://mujojodisi.22web.org/45014444295.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/rYijpjc/sokibolajoromobilajatene.pdfIn PDF document text
    • http://zagadadafe.22web.org/zuwifaduwokalavuroke.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/0d1abb52-b7be-4a1f-8873-396e0c598fee/xurelajijexipezoxugife.pdfIn PDF document text
    • http://bexiponezewan.rf.gd/tafapubonawapolefebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49072bc8-7123-4cba-8a48-069eb9b3bf1e/54911215628.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_93db12e95e584e19b2310b84ee05b012.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_9c50df3c678d4e44b25c3ab1085cf3be.pdf?index=trueIn PDF document text
    • http://zotapem.rf.gd/70567825607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2462cd85-ad99-4879-a963-84c7c058936d/this_is_amazing_grace_lyrics_and_chords_key_of_a.pdfIn PDF document text
    • http://mipesijelu.rf.gd/weathering_and_erosion_video_worksheet.pdfIn PDF document text
    • http://zanutebuxeboluv.rf.gd/what_are_the_different_types_of_hydraulic_fittings.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_bb71cd0a6d91447a8e6309ee6f95dc03.pdf?index=trueIn 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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 5000 bytes
SHA-256: f2c7241a60d1f0c464ab92217c48985c38e271ade1e991eb0c2e0e2e5a08f303
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 11772 bytes
SHA-256: 50b589799c8732525c390d895d80eb90e5c4f5ea5a0d9427f7044ed6877d602f

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