Malicious PDF — malware analysis report

Static analysis result for SHA-256 c428997ffcf92b76…

MALICIOUS

PDF

70.0 KB Created: 2021-04-05 16:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 981d7d20080fd1e0b956aec938c004c3 SHA-1: e7f96b8bd2b12aad4ef84355ac850621a98b0794 SHA-256: c428997ffcf92b76d6c8e737150a3249a6a16d09127a9b6236a479b83d65b5a0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=askep+bronkiolitis+pada+anak+pdf PDF link annotation
    • https://cdn.sqhk.co/mowaxuso/Xhjgjgf/baby_toilet_training_seat_target.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/aTpdD53/drastic_ds_emulator_apk_free_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/v6Royhd/43629151620.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/fjcvWjc/90890592624.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/fyJiizZ/vodafone_free_international_calls_christmas_day.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/68fyjfT/change_twitter_notification_sound_android_10.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/ggcieih/3d_tennis_game_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/fKJIIZ5/draw_cars_super_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/iiisjfI/labodafexipemed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ba1984-b5ef-4ef3-a8b4-539bccdaecf1/sagakode.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_db3865603eff4bd1a186707939af15e5.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_6475c563652d4b7f921bd5c7d625fa38.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_dcccfe3772f1428a810ed337d29a6279.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_c37c82671eac4e47ac043e52425a2ff8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f73ffe3-d051-4ac7-addc-e8dfc1924625/grade_5_english_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0454bd6-a4ec-4cb4-af0b-47e434e9f454/what_is_a_civil_process_deputy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4a8795-2b89-4c59-b9f1-9b0c47d0ae0c/what_is_a_callus_in_bone_healing.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/bunuzegal.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/45691028756.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_19b6a6cac47e4296948d46529541728a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be00031-3807-427b-bdf4-fa631ca4311b/devovi.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_06f1de07db754f02919588c4803d49ac.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_7565854588954ae3adbeace0cb5e3eff.pdf?index=trueIn PDF document text
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_2e41b215e3024f118277cfb6e093fcc6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 5228 bytes
SHA-256: 1ecbdd74e97f942c5a94eb1b10a9dc61dbbd6fcbdeb64d9a13bbbc3548e0c475
font_01_sfnt_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 10328 bytes
SHA-256: c23d1569d732fcb6126a1ea4e4c9d6fcfdf1ff1aa820b5983c14b72556094028