Malicious PDF — malware analysis report

Static analysis result for SHA-256 458d6a3e0af7c4e1…

MALICIOUS

PDF

70.0 KB Created: 2021-06-07 13:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9f1d3a91e4b95c1c360e8548f8932a6e SHA-1: 0a52f94d12f8b93d9b7653585f510e2c0a084608 SHA-256: 458d6a3e0af7c4e16a99cde1923470e142cca6303638e4a6c4e568de8c363fe1
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'chcial.ru', suggesting a phishing lure disguised as free crochet patterns. The PDF structure and the presence of external links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/pbw?utm_term=free+crochet+doll+clothes+patterns+for+16+inch+dolls PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392860/normal_5fdc563fb3873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_60521e6595ca6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450907/normal_5fcb4039d1aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_605d797b84b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_5fe90d2d4d8f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_6013a2768f2d3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4487658/normal_60b1e7c2a58be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rumusapage.pbworks.com/w/file/fetch/144646191/862424418.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/5441595095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b8f764-732a-456e-9dd3-d023b8e86042/wisimefadegogufog.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/fahrettin_razi_tefsir_oku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fec76e4-f984-4aa0-b6a9-702bfc5ef135/bivegobaribigon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646a19fd-66d3-408f-8e1e-2d6e619cf7dc/35686155681.pdfIn PDF document text
    • http://vazexetuv.pbworks.com/w/file/fetch/144565248/i_could_not_stop_for_death_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9ac12b-534e-4c94-ad49-10e64ea17b53/tom_sawyer_theme_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e94f6b-5bbb-464e-babe-56e41a971fdf/movox.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/rangers_apprentice_book_13_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc93377-dcc7-414b-92d4-9cb6b26e31b6/animal_jumpsuit_pajamas_mens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c143bf1c-0876-44e1-bf14-658a76f6c042/how_long_to_become_an_educational_psychologist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779c508d-7841-4652-8328-2c5a79de7c3e/how_many_words_is_harry_potter_book_1.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_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 5404 bytes
SHA-256: 7090f0cc22a432b6f6e6f8dd5fabad116c85103a88def346f7eafbd6bf6b7f62
font_01_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 10120 bytes
SHA-256: 067bc6005d461d1b85626264b80be914d510348c830f5a7599ff1859c502dcd4

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