Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f40e5170d1c7496…

MALICIOUS

PDF

107.4 KB Created: 2021-03-29 21:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d5898d9c28531d62dff80eae0b2a02d SHA-1: 772eae1bbc156ed09fb35532b9ef55043ac72c80 SHA-256: 0f40e5170d1c749604818c644905639dc9209f53468e9041a90fda4e64feb0bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO poisoning tactic to distribute malicious content. One of the primary external links points to zajinet.ru, which is likely part of the attack infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/award?keyword=reinforced+concrete+materials+pdf
    • https://cdn.sqhk.co/leredupodeka/cbheAFo/ways_to_improve_traffic_management.pdf
    • https://cdn.sqhk.co/mogizilo/jjifii3/28307992432.pdf
    • https://cdn.sqhk.co/vozevadijut/Hgfahgy/interstellar_cast_imdb.pdf
    • https://cdn.sqhk.co/firataxoworo/jghijVD/59073540253.pdf
    • https://cdn.sqhk.co/pemenodisoda/jfhgOjd/mini_cooper_dash_camera.pdf
    • https://static.s123-cdn-static.com/uploads/4419218/normal_5fef00eaad511.pdf
    • https://cdn.sqhk.co/donuvoduvedo/hjXqXjb/49624465441.pdf
    • https://cdn.sqhk.co/jabosuve/iejijjN/88737870739.pdf
    • https://cdn-cms.f-static.net/uploads/4385412/normal_600a4c69df6e5.pdf
    • https://cdn-cms.f-static.net/uploads/4412388/normal_601bc38e5eb9c.pdf
    • https://cdn.sqhk.co/dolafita/dgd1ijN/vekobaponobugorido.pdf
    • https://cdn.sqhk.co/pejinijew/jISjc1K/71753501169.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_eea1ab055ce34ec689ce7ed3b00a36a7.pdf?index=true
    • https://s3.amazonaws.com/dinigugaxej/lapd_obtaining_police_report.pdf
    • https://uploads.strikinglycdn.com/files/add10233-dc7a-4979-8d59-13a1e0b41bb9/tabla_de_medidas_de_brocas_en_pulgadas_y_milimetros.pdf
    • https://s3.amazonaws.com/gotenukevepunin/dibujo_del_modelo_atomico_de_arnold_sommerfeld.pdf
    • https://uploads.strikinglycdn.com/files/165ab28b-5bd7-40c2-a519-15647abb15fe/maxcare_extended_service_plan_price.pdf
    • https://s3.amazonaws.com/remavuj/xilojib.pdf
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_95780a451f204d1cb30a759cf4bdcfa3.pdf?index=true
    • https://s3.amazonaws.com/punagilelabon/what_was_lincolns_proclamation_of_amnesty_and_reconstruction.pdf
    • https://uploads.strikinglycdn.com/files/c6595991-ea86-4f06-8300-6241b4f5b88e/vebajijoxelaj.pdf
    • https://s3.amazonaws.com/sefepugolupalax/72536988806.pdf
    • https://uploads.strikinglycdn.com/files/d900e967-fd1e-4af6-a738-f2a1b8f58921/unfinished_tales_of_nmenor_and_middle-earth.pdf
    • https://uploads.strikinglycdn.com/files/b5fde84b-a270-40ec-9044-18e0a6b4115e/car_electrical_wiring_diagrams.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://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015618.bin
a9526a52fc1e6208c8e5e361c129aac057ee77e7fb594a423979dd86f1a6d1c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15618 5308 bytes
font_01_sfnt_off00016809.bin
7a02da73c5ff24218d04b188db7d31ceb9303d5dedd43b645f18a615a19d9b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16809 6068 bytes
font_02_sfnt_off000177ba.bin
d77011e7d4751b77bfcc19d617759d4825f51f30f9426fda8f3249991a3ca8b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177BA 11992 bytes

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