Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad31e2440376ab76…

MALICIOUS

PDF

81.9 KB Created: 2021-04-06 15:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 09f89b2585df53af2e76ac3076a68871 SHA-1: d1c86dbb569bd46147bf80e2738d1fe63d8b4ea1 SHA-256: ad31e2440376ab763e22e82b696c95b4df741e38531cb7d5ee1aa085be18dfb5
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated, but the presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=calligraphy+pen+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/vopunokapire/wGE7Oja/sonic_4_episode_2_lite_mod_apk.pdfIn PDF document text
    • http://guitar.su/shri_amarnath_yatra_video8sx87.pdfIn PDF document text
    • http://sait-ok.ru/tixowugitinrul6m.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/jafipiv.pdfIn PDF document text
    • https://mezufimuvuleto.weebly.com/uploads/1/3/4/0/134016906/kojifolevizaz-newijolutedi.pdfIn PDF document text
    • http://gonzo-3d.com/how_to_draw_zombies_vs_plantshiysz.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/WRbFG9B/fashion_cover_girl_makeup_star_mod_apk.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/986cc.pdfIn PDF document text
    • http://refesuf.22web.org/zupewosiwofadev.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/mowinoguj-netiki-wavudaledoz.pdfIn PDF document text
    • https://cdn.sqhk.co/jijipidub/g5idvii/knight_dark_fantasy_gothic_live_wallpaper_lwpc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_c0c2edc295ab44f6b671b258fb73a8d7.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_a34e519fc0af41c1ac381bf36d481b69.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_79e0b3ef15b04c029c64b65eb29cdd3a.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_7bcda7f7e16b4382861dce053d83761f.pdf?index=trueIn PDF document text
    • http://vavilomakuv.epizy.com/how_to_add_apps_to_apple_tv_3rd_generation.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_060e20d3c3494c51b7e45980e4b06a7e.pdf?index=trueIn PDF document text
    • http://mutizurik.rf.gd/34847535468.pdfIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_e0abb72268a147119e997ee0450c1f7e.pdf?index=trueIn PDF document text
    • http://poxemibusap.epizy.com/ap_stylebook_2020_free.pdfIn PDF document text
    • http://rejeremonuwiz.rf.gd/addition_equation_and_conclusion_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 3044 bytes
SHA-256: b19ba1383144a0698a036c9c6fc1c5de81e9a00589aff796d05797a7d27b152b
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 5464 bytes
SHA-256: 4492586b8423ed3f94cd953281bc6c82502e88d9bca74b088d65ae60c7c58881
font_02_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 10732 bytes
SHA-256: 15d24e59f12a2e136b0b19481e569da891136ce7b13d74d7e694cdc1c7dad8a9