Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef021a63b37d8286…

MALICIOUS

PDF

71.2 KB Created: 2021-03-18 07:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3f57246d0f0b2c3affaa7b5457f4a6e5 SHA-1: 983d88f05ac7ab1d1cd04da95561dd850c01e05f SHA-256: ef021a63b37d8286629f848b9dd8deb0919c91eb8b107c4d35d981f9fc6caaad
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=ps+109+brooklyn+website PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490371/normal_602567158d6af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_602b71bcba709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_6042953c73a87.pdfIn PDF document text
    • http://banepudota.iblogger.org/fotujivigeriwobi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470703/normal_5ff62b6fdff27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mowigefugitixa.epizy.com/pokemon_battle_revolution_free.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_099ca5a258114acdae1d5c0d703a6d6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/728a7946-9ad4-4893-b9f5-f35a9dfe164b/why_mic_not_working_in_google_meet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0300a589-b2e0-4fec-90b9-b6afc0f8988f/snape_the_half_blood_prince_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd56113-1c9f-4680-acaf-3ab7a093ba4a/how_to_connect_dell_wireless_mouse_to_laptop_without_usb_receiver.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_affd88ca198a43b8b28d4baf95de85c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f79660d-adb2-4ca5-ade1-aac2d006c830/gesozafovopifixifudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b768f2ef-0551-4e5d-a41f-90e6c2b2e5ce/how_to_use_a_blomberg_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1f5359-329d-4546-94b9-a53059536bb0/84555483851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91b3399-cfa9-4020-aff8-fc84048966d1/mubasubisi.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_9c99592fdcff41a689d4a6b31b3daaea.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_b63f56656ed04e5bb11768591fc198db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/356a5812-7509-44ad-8410-10a705b2e49c/77483221217.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_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 5220 bytes
SHA-256: c2e43d7938c9ce2b909357fe96ddde3847c07a0c2a34a23c20f507346d68d24f
font_01_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 10976 bytes
SHA-256: 004681d48d9dfe91041bc334396c26fcf858b4aec4ce95d54896dbdd6cdd75fb

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