Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2274c21b19b59c…

MALICIOUS

PDF

91.2 KB Created: 2021-02-25 00:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 24ef12811f9cefeed2e5a15e7a482d73 SHA-1: 37bfc2513f556ac4b45d38de053202eea43cda53 SHA-256: ca2274c21b19b59c29a9843db6422a7d28f553cfd8256c7a88672a67ead25862
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary one being 'https://seumenha.ru/wix?keyword=graphing+calculator+plus+apk'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. ClamAV detection and ML classification confirm malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wix?keyword=graphing+calculator+plus+apk PDF link annotation
    • https://tabekemaw.weebly.com/uploads/1/3/0/8/130874329/90227d.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/92671819202.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/Wjdheif/samsung_music_edge_lighting_apk.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/rapedonoroneditilaji.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/UrpLLr2/xajavekufodulufe.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/what_size_tires_are_on_a_2005_chevy_equinox.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/jdhalEt/47674374371.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/zugawi.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/81789dc7537.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/fmrhfZw/xelakenuwoza.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/R4q6Qic/weekend_ushering_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/exgcjet/36477875624.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/62993779788.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/ignition_scada_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/ronobumek.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/is_python_the_easiest_language_to_learn.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/tozarakamunusojonibeja.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/cars_fast_as_lightning_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/kidifumakaroji.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/your_name_ringtone_mom_calling_ringtone.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 5052 bytes
SHA-256: a709cdc52dfea2cf025c101dc75f5d62f625d8994031888b24799334d08a9041
font_01_sfnt_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 15968 bytes
SHA-256: 38f877deb291ec037c482c09a52e259f628363bd39813f9df3be1e25d74881e4
font_02_sfnt_off00013b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B40 16228 bytes
SHA-256: 0c9c56924b6bb188c3b525a858e33208ff956159f7672687f96fc4825c70d16c
font_03_sfnt_off000150aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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