Malicious PDF — malware analysis report

Static analysis result for SHA-256 a664b1c5f3c9290d…

MALICIOUS

PDF

74.2 KB Created: 2021-03-15 05:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5cff01cd0dd4f79ad7f70c27ada122ae SHA-1: b6609080d602007407dcaa742f5dab48d1d23f16 SHA-256: a664b1c5f3c9290d0ebce949cdd0d8f9cc80213c5ebb5240563c02971c4fd7d3
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The PDF document body, though heavily obfuscated, appears to be a lure related to a 'Bikol english dictionary pdf'. No scripts were extracted, but the presence of many external URIs strongly suggests the document's purpose is to redirect the user to malicious sites.

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://jumiwimov.ru/award?keyword=bikol+english+dictionary+pdf PDF link annotation
    • http://robugipunebib.mygamesonline.org/xobebebisej.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/aws_cloud_computing_certification_course.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/43796605118.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/hjhiLGn/marine_turbocharger_diagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_60366a860e798.pdfIn PDF document text
    • http://sabewasarakabi.iblogger.org/catholic_answers_self_flagellation.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/how_to_release_psoas_with_foam_roller.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/hg3fhgp/spongebob_moves_in_cheats_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417992/normal_5fee375593e36.pdfIn PDF document text
    • https://cdn.sqhk.co/dupabeket/icMheL6/narus.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/which_of_the_following_best_describes_the_probability_characteristic_of_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5ffd01325f7d8.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/gjbihgj/simurajurow.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/DjeojeD/buwinikojog.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/1b9ec261-8b24-4ef1-8a72-55d6d06a85f0/fuwozewinevepeluwobewup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818c5a20-0daa-4d20-abc0-0a0bac0f676a/honda_model_hrr2168vka_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badb6a94-941c-4d32-95ff-eb1534596e67/filexufefabizabo.pdfIn PDF document text
    • http://zibuvovod.rf.gd/muvafubipegerusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9f5eb8-dfca-428d-a45c-819b62c36fe7/zigog.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/lowrance_hds_7_gen2_touch_with_hdi_transducer.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/44001890524.pdfIn PDF document text
    • http://gisudaledusuroz.rf.gd/machine_learning_basics_free_course.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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 5632 bytes
SHA-256: 51a706d73fa4a8a6fbc05d078074207360f25bcef984b48b6ed0223e2ba1dc42
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 12124 bytes
SHA-256: 4e32d1076c45f7ffaac5631868ddb2e2fc481100bf80c6614b0f3391c416c368

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