Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e448940c4fecf9…

MALICIOUS

PDF

80.3 KB Created: 2021-04-08 02:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f956a3adc33e47ea3decb2f621e8bb55 SHA-1: 574318bf39e0307bc82bce1a0757e0bd8827f21c SHA-256: 24e448940c4fecf9f0e58685b4e9b3da4791fc0e3923769c2e2ca8ee5b8799ac
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. Another embedded URI also leads to a potentially malicious domain. The document body, though heavily obfuscated, suggests a lure related to search results or informational content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=one+less+worksheet+eyfs
    • http://tarenutufitox.66ghz.com/zazuzuxurak.pdf
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/269bb6.pdf
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/mumovezi.pdf
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/0129cb3.pdf
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/tetalibima.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fevusavumerow.rf.gd/74755451238.pdf
    • https://uploads.strikinglycdn.com/files/26b27a46-d89d-4849-b45b-a756c84c5427/how_to_know_if_u_have_a_pimple.pdf
    • https://uploads.strikinglycdn.com/files/636cf8e2-dfa1-4bbb-b24a-55d805575c13/my_lg_dvd_player_has_no_sound.pdf
    • https://uploads.strikinglycdn.com/files/f717b410-d3c1-479a-9fdf-63f608e69791/jugatolapatotibotufokedub.pdf
    • https://uploads.strikinglycdn.com/files/d5de530f-1961-4b19-9aff-f20271b33fb2/ducane_heating__air_conditioning_systems_review.pdf
    • https://uploads.strikinglycdn.com/files/39bbb74d-b1b6-4e89-9b0c-d5d52749151f/jewelakelipogameboxetor.pdf
    • https://uploads.strikinglycdn.com/files/596a261a-dd5f-4b86-a4d9-7feb17a7d671/sex_and_the_city_2008_charlotte.pdf
    • https://uploads.strikinglycdn.com/files/e4378d99-e544-4e40-adc7-f79a4ff4df22/33075496472.pdf
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_37c32e1c55434fe3958181e89b36951a.pdf?index=true
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_92abc3ce1c924794b932c12251b8336f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/269a14ab-c5e1-4901-afcc-af4e411dff23/2655462301.pdf
    • http://zizaxutezojewif.rf.gd/40552955187.pdf
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_5a0eb0e4064a451d97430332e19316e3.pdf?index=true
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_edcf1299ab084674922febfd30d6e10a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0aad849-a842-4367-af09-c9eae993790f/79050023294.pdf
    • https://uploads.strikinglycdn.com/files/6ddbddb6-0e72-4dbd-b6a5-a664d846a999/ejemplo_de_resumen_de_un_trabajo_monografico.pdf
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_c161cb8e9e7242a2a95558fc75674196.pdf?index=true
    • http://zutuzus.rf.gd/57028211422.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72e.bin
768dc9105090ea3df7ce3b0dbaffacaa417d1cb1666a30a0d422cb323bfa91f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 4932 bytes
font_01_sfnt_off0000f806.bin
98fa0b14a2d342516ea251bcc42eb99b9e95f0011e31c8c398d287a111e6c1a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10680 bytes
font_02_sfnt_off00011cc5.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16204 bytes

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