Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b99a1612f543c5…

MALICIOUS

PDF

73.4 KB Created: 2021-03-12 09:37:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4ae3c414609159cf770fecb064da708e SHA-1: f1dab50dcd58e1eeaaf2d3152ad6830c4d23d25d SHA-256: f1b99a1612f543c5a73cf77c66536514f4c085e05c5fa00fbdc831cc380eb1cf
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded content, though partially obfuscated, are consistent with attempts to redirect users to malicious sites for further exploitation.

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://mezovuduw.ru/wix?keyword=understanding+stem+cells+worksheet+answers PDF link annotation
    • http://xubanapirobula.mypressonline.com/solucion_isotonica_definicion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_603a3fc0e5c24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449766/normal_600692ca862e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5fddbfd39b4f3.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/the_meaning_of_marriage_timothy_keller_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fd5f5e4a8806.pdfIn PDF document text
    • http://mibejar.sportsontheweb.net/cesarean_section_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5ff88954ce489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_b4570510c6b7420c80abcba7781f0e5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea56407-93d5-4d5a-8411-b9ff5aefd118/60979249544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c103c43-2a61-4f62-a909-f3811727c357/where_to_place_tens_pads_for_knee_pain.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_20fd268b9e5842328ff012ff2b5a1ea0.pdf?index=trueIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_ac27a6489d2f44dba17c4f1823607b37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2acff6-6897-473a-8d9e-eda4850666b1/69742640063.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_7de54ad810744197be5461a5439f54e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9d1d81-8d2e-4387-a014-6af35e262b5f/dr_seuss_books_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9242fa-933d-468f-b258-f4ce1939219a/50234590345.pdfIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/zalageje.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_000ba7539e61458f98294b3e4dbaa2a9.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_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 5500 bytes
SHA-256: da8cca30cc6d8b8bbf4c70bf2cbef668aff5d63d12aac7909054d708f6e3e265
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 10332 bytes
SHA-256: 655e3ed493ba07e4b6917d9ee97066e0fe23a9756a5e5677fd5b9cd21cd2539d

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