Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91e9933d0e76650…

MALICIOUS

PDF

76.6 KB Created: 2021-03-03 01:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 487e2ad8b59f652f67bfde759b9c7676 SHA-1: 8a0edd071b98a71e53c6e19211034dbf46b98e6f SHA-256: f91e9933d0e7665024d320492825671c38b696da28261bdf9a4c36df89ad112c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The embedded URLs, such as 'https://zajinet.ru/award?keyword=how+do+you+open+a+schlage+lock+with+a+dead+battery', are designed to trick users into visiting potentially malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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 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://zajinet.ru/award?keyword=how+do+you+open+a+schlage+lock+with+a+dead+battery PDF link annotation
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/tutage.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/ahcK5Ar/bojepelufoxutexesexefiv.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/if0ggjg/child_care_assistance_program_ky.pdfIn PDF document text
    • https://cdn.sqhk.co/rawatajizefu/dPghigJ/baked_cod_recipe_panko_parmesan.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/sigfCje/84920543830.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/PUgdzrc/the_outbreak_movie_watch_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/e2vhjGf/4_pics_1_word_game_answers_woman.pdfIn PDF document text
    • https://cdn.sqhk.co/webuposiba/mjhJ1pi/warzone_2100_cheats_steam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5ffc63879f5d5.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/jd3HNjg/pic_collage_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/iidjejb/craigslist_sf_apartments.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/wizomoravazub/mozisupiwogotibow.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/heretofore_crossword_puzzle_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/nervous_sweating_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/87014071877.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/c_string_concat_performance.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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 5692 bytes
SHA-256: fa5252a6a1e92b1db19676daaf8c872733e417bb4025807a98adbc5baa9f42d4
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 10656 bytes
SHA-256: 9ba62ead09e7b956421448efbb4a1dd0710a15f1fd496fbda411d50a21b66f1b

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