Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1eb9a18f8f86f3…

MALICIOUS

PDF

107.6 KB Created: 2021-03-17 11:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 967f38e2e0300e6b5e04c0ae9cee871c SHA-1: ac1275dac8b55ac60d159a40ad2ba10ae285579d SHA-256: 5c1eb9a18f8f86f346bad316bdcfb0e551c081c969f368d497cc094930251884
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as an SEO link farm and a high-severity heuristic flagging it as an image lure linking to an SEO redirector. The primary malicious URL identified is https://fokemale.ru/strik?utm_term=sri+rudram+chamakam+with+meaning, which is likely used for phishing or scamming purposes. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fokemale.ru/strik?utm_term=sri+rudram+chamakam+with+meaning PDF link annotation
    • https://jotonude.weebly.com/uploads/1/3/1/3/131398177/nilifu_zosatufaj_tejoji.pdfIn PDF document text
    • http://excschool.ru/34383371956i87nn.pdfIn PDF document text
    • http://matrixbicycles.com/workouts_by_katya_week_4rg094.pdfIn PDF document text
    • https://botironuz.weebly.com/uploads/1/3/1/3/131380999/9809754.pdfIn PDF document text
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/fd1a9f185f9.pdfIn PDF document text
    • http://healthyforczechrepublic.site/sambalpuri_mantu_churia_audio_songkcvye.pdfIn PDF document text
    • https://repowuvosifopel.weebly.com/uploads/1/3/6/0/136050091/1b86304.pdfIn PDF document text
    • http://about-central.com/98170591329r3vjp.pdfIn PDF document text
    • https://butilitari.weebly.com/uploads/1/3/3/9/133997497/1070659.pdfIn PDF document text
    • http://italiabeach.space/192241915698w132.pdfIn PDF document text
    • http://azorocheat6.xyz/39502232104uov23.pdfIn PDF document text
    • http://sokfresh.fun/mississippi_drivers_license_test_appyjvff.pdfIn PDF document text
    • http://mivetys.xyz/honeywell_space_heater_reviewspl7in.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/novifamigot/common_core_math_worksheets_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/challenge_film_video_song.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_05fd4fe9044f4456b2b47aa517e107c5.pdf?index=trueIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_b84de7fbecf64590b1cebdf3aee3fc87.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_3b3bf6c1236c4457bbb7ef26fd40aa5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/jujugoparerubesosir.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/80329242107.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/the_white_tiger_book_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/dhhs_panel_on_antiretroviral_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/cardi_b_club_c_shoes_-_grade_school.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/18177318751.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/new_hd_movies_bollywood_2018.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_27a095528ba64db39cce5a967b733b83.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFD 5400 bytes
SHA-256: 9f6e2921fc6c129800a471b8948506fabb2ef998dd1def112f5650b3408f28eb
font_01_sfnt_off00015e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E46 10584 bytes
SHA-256: 7a3d947bfbc15a282e4e6e28de7e628ef74ddf4d320add4a3dca1e44a4a12252
font_02_sfnt_off000182d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182D0 9032 bytes
SHA-256: b37e0867647e3d4e8d5fc2da62562982bc02e0be97f8d138618369deadf7516a