Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2d4e440b4da507…

MALICIOUS

PDF

76.6 KB Created: 2021-04-07 15:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b669838098481c27c59c45c4b71c5bc2 SHA-1: b23ecb1d9e5cb0bcff6df8e16ab25d31aa750bd0 SHA-256: 5f2d4e440b4da5072e4f76db6166b21802e4001180f26e6404a702def0bdbdef
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One of the primary external links is to 'xajibur.ru', suggesting a phishing or malicious content distribution attempt. The ML classifier also strongly indicated maliciousness.

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 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.
  • 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://xajibur.ru/123?utm_term=lateral+raise+dumbbell+form PDF link annotation
    • http://drilltech.info/the_sparrows_nest_athens_ga_30606gjtnd.pdfIn PDF document text
    • https://kulitexujaw.weebly.com/uploads/1/3/4/0/134099612/duzikevovanirigiteg.pdfIn PDF document text
    • http://fullhp.info/2193869244bnwcy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_604d3a3fdeb9c.pdfIn PDF document text
    • https://jozitosada.weebly.com/uploads/1/3/4/3/134325699/5e47967cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_602b89737253e.pdfIn PDF document text
    • http://scandisvet.ru/tabuparljnn5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5fcca50bd09f6.pdfIn PDF document text
    • http://austritkfa.com/canon_powershot_a720is_review7jme1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427295/normal_5fec452694aae.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/sufonopumelik.pdfIn PDF document text
    • http://rezonansmusic.com/pevelafoziwilewgc7rj.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/best_instagram_hashtags_for_fitness_modelseuk8m.pdfIn PDF document text
    • http://esportzmlevent.com/first_grade_math_problem_of_the_dayq3zs2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449422/normal_5febf69c4c1fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sabegokek/java_jdk_win_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/76182107808.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/assamese_to_english_dictionary_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/what_is_a_network_support_specialist.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/puzzle_games_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/66297845844.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_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 5136 bytes
SHA-256: 352afc6ca043cce07acee8dde13d0b056e175ab3364e1166465bd9a6d7754301
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 10508 bytes
SHA-256: 72b537bbf50a814dd4b8f56c342395cbfdfad4e4337306ab3d0ef53c3fbd13db

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