Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f31a28c30de17ad…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 05:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a252d5ff61e169fb45c5747116be0eca SHA-1: c6a5c3e6011fda2341c12e9cee8e96ae448ecd8c SHA-256: 6f31a28c30de17ad42a28091298443fea27da872b9c6863f7e9bb23ff934c897
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one that impersonates a movie download lure. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/strik?utm_term=in+a+dark+dark+wood+movie+2019 PDF link annotation
    • https://cdn.sqhk.co/regomesu/haihESz/60970278998.pdfIn PDF document text
    • http://ehaberdevlet.com/mac_os_sierra_iso_image_free_downloadrjjk0.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/ahiKugc/piano_tiles_2_pop_songs.pdfIn PDF document text
    • http://it50life.pro/ritutagegokivemebodukubx1jik.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/jghi5NN/lakers_game_memorial_kobe_bryant.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/Ljhe6if/pokemon_wallpaper_ipad_mini.pdfIn PDF document text
    • http://allerlo.xyz/starbucks_barista_job_descriptionnetdj.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/guided_hypnosis_for_sleep_and_healing.pdfIn PDF document text
    • http://classkaod.ru/37629141460l9f1h.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/how_much_to_get_a_book_spiral_bound69neo.pdfIn PDF document text
    • https://cdn.sqhk.co/kutogudofi/ijhghg4/boo_radley_quotes_mockingbird.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/fosalizuzu/fha_inspection_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/mexiso.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/barin.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_2383e031ead5440db2fa964e8e74593e.pdf?index=trueIn PDF document text
    • http://jopavufugas.epizy.com/51886522264.pdfIn PDF document text
    • http://bemijeranokawu.epizy.com/firefighter_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/65280342539.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_e0171ff17a3443e99d679682be778c25.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_a185d22750dc47f8b23430a78625e025.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_c71f965a11654e00ac7fe77ea02377cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxulija/tojefurudoxeg.pdfIn PDF document text
    • http://mulirogikek.epizy.com/vimebeped.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_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 5396 bytes
SHA-256: 9493e70367558d790f76b997595a3c0e2c1531104d1e1e461b4f9eb34d1a457e
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 10944 bytes
SHA-256: 9b8d7e8f2b24a34583aa5d01c8dcb34c26e683d4defe36d2c9bb79354be4d019