Malicious PDF — malware analysis report

Static analysis result for SHA-256 1396bd4555daaf0e…

MALICIOUS

PDF

73.3 KB Created: 2021-04-03 11:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 55009e185d690c08ee60f6431ff3f742 SHA-1: 570544045860368bc724098b82d5560770b2cf53 SHA-256: 1396bd4555daaf0ea6a3068b8ac24857ffd1b0204b445cc7680a3a6576c9da44
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 0.9996

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://resalured.ru/wix?keyword=the+earth%2527s+layers+foldable+answer+key PDF link annotation
    • http://joy-todays.online/english_file_upper_intermediate_test_booklet9kmrx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_6019ac16d6510.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/i9qhcWK/steamboat_springs_condos_for_sale.pdfIn PDF document text
    • http://luminar3-download.xyz/vimavofiwikebugafe26o9.pdfIn PDF document text
    • http://wssummer.space/546038476109a6y5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476147/normal_60068e06e3f9a.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/how_to_postpone_medicare_part_b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_5ffb14ea2a867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421329/normal_5fdfbcef58a7a.pdfIn PDF document text
    • http://characduwe.space/106546913225yqeh.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/maluxuvaxuvatunijere.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/88013051682j2z45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_604366cf71f8f.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/hMhc9hi/koran.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/O4CEge9/kigimivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fe9a995bf8c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_6029d56f3a083.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/9cc0a996-ea5d-4f7e-a9c5-ebd2b902763e/56932774880.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/29830064173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e0dc2d-f470-4727-a6e4-aa0f1a2ae879/wuguxili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9ea216-17df-40b8-8bdd-50747ebdfd53/proper_way_to_transport_a_grandfather_clock.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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 5116 bytes
SHA-256: ae0d4199005c9876bb5715095e0e3c0a220c6ea4f98059945811e96b8589b619
font_01_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 9764 bytes
SHA-256: a16dfce332516ab3df5dc7562f7d572d1c1fad55cc52b7ddf1049c753750d707
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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