Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd7c1512a85263b…

MALICIOUS

PDF

72.5 KB Created: 2021-04-18 23:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 78b05cf38d74a628a0b6209e2375946f SHA-1: b04a6f7d19e9cd1fb2d73648a4ba2e16c7643f37 SHA-256: 9fd7c1512a85263b43bf921a4d2bb70c8d57b7bc138af35bd8f7ce99a77ab4bf
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 0.9998

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://midufefew.ru/strik?utm_term=which+elements+have+4+valence+electrons PDF link annotation
    • https://xagofutaruv.weebly.com/uploads/1/3/4/3/134344009/02bce80.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/BtjeRUS/wirizaxijereda.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/gichiUr/the_impossible_quiz_book_chapter_1_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/difggIL/fosatevafawowirurizakotij.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/kelototazo_vaxinedajam_nirik_dabagegezodamag.pdfIn PDF document text
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/7f80b9ff2381.pdfIn PDF document text
    • https://wozedekasejop.weebly.com/uploads/1/3/4/7/134703393/jofuwajawexira-nanujawuli.pdfIn PDF document text
    • https://mojulikobamod.weebly.com/uploads/1/3/4/4/134488450/636819.pdfIn PDF document text
    • https://cdn.sqhk.co/jogibigeda/yz8hfjb/25287289800.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/b087f9bc-5e2a-4e16-8dad-726ed1d937ee/what_to_do_if_my_treadmill_belt_is_slipping.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/fawigopusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5098dbfa-e1a7-4d54-8dfa-615e03a8380d/90741214652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578bdb82-289b-4ab3-94a3-26216adcad58/b._razavi_rf_microelectronics.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/kixowomobesopubowumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e545e69a-e446-4a1a-84a3-cca5bd4809e3/81686168302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b994058b-f0d5-41ef-870a-0b45ea5c6cf4/telefone_assistencia_24_horas_bradesco_auto.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_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 5200 bytes
SHA-256: dcd887dc162bfb96f7c6a4ff814b2e19268370964f15f2f6a912f8c6356aa095
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 10248 bytes
SHA-256: 9053b052d1d547b2459d65f806b8d3108c8a34a6be366940d5acffd441861fe3

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