Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77dd0d7bf8c956f…

MALICIOUS

PDF

79.1 KB Created: 2021-04-03 20:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 830141e6b2cfb8788a0e74b51480adcb SHA-1: b2e9c71255a19a6677e7fc2583c8af79f47acdb3 SHA-256: c77dd0d7bf8c956f41d5b8c3b18351758da5b393c377b3496062a62d521e5b5c
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=dead+ahead+zombie+warfare+cheat+apk In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/appellancy_no_jailbreak.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_fdda841bb1e64fabb4e382d283879cc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/58056888315.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/razer_ouroboros_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51178ae2-492d-4eaa-9f51-8922490edb92/ocarina_of_time_3ds.pdfIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_b15aa76cc4d84cd3973aeaac1b7310a1.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_6cd073b43a0a41329f840fcdaba4fe94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafc9e5f-2b1a-4c1a-bac3-6f987c38e567/lemulezexila.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/gonuvuwuwoxune.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_6f69d604b1724921910deee11e8189e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/9005818645.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/fanajavadotesizifabo.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/calculate_income_tax_payable_on_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/dapaxipamixiv.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/augmented_matrix_equation_form.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_ce4912a9c8b54d08851c8adf32454a2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafexegud/sense_and_sensibility_movie_on_youtube.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_2ce258b24d824c9982cabf3442038752.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/xobizelo.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/showbox_apk_2019_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/81991483296.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 5532 bytes
SHA-256: 07f013d2376f9fe195c53e3834b29597e9d5b803d0ef50478ac007632533f635
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 22020 bytes
SHA-256: ade18e393d624d5d4041f36a43a27fa18ec830244a99561b9fdc254bd0d0b5e9