Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbebe1dc5b8bfe1…

MALICIOUS

PDF

92.0 KB Created: 2021-03-07 12:37:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76917fc43b391524cbee7b252b91f59d SHA-1: 0898a8102ecaaba81544ca4d605319711acbe32b SHA-256: fcbebe1dc5b8bfe18ab12ab7cfc62a90416965b76a54ccb7472d62cdbe9f6efb
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and hosting services, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/wix?keyword=is+kiddo+a+term+of+endearment PDF link annotation
    • https://cdn.sqhk.co/wodaximewule/w2jahha/fewaso.pdfIn PDF document text
    • https://cdn.sqhk.co/xozifejor/inOBWhg/eye_color_change_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/Liaifhb/sajoxus.pdfIn PDF document text
    • http://paksorond.xyz/hp_officejet_4500_print_test_pagegxawu.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/agatha_christie_book_list.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/Mhcjhje/sandeep_maheshwari_love_quotes_in_english.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/84241398977.pdfIn PDF document text
    • http://tujubafi.getenjoyment.net/what_is_the_rule_of_30.pdfIn PDF document text
    • http://verification-help.business/pokemon_ultra_sun_and_moon_how_to_change_thundurus_formgj9dy.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/gdifiao/my_verizon_wireless_business_account_login.pdfIn PDF document text
    • http://pinerapidsrr.com/65944223501d5ldt.pdfIn PDF document text
    • http://japancar-sib.ru/796269629740vdh4.pdfIn PDF document text
    • http://bbflowers.net/what_is_the_word_equation_for_fermentation_in_yeast_and_bacteria4ewsi.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/42329347266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_9395d979f3564e84bd7257f3cffa7ac8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf99714-57fd-485f-a872-0f30471b88ea/61069936658.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/daily_activities_worksheets_for_adults.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_624d3609a94d413e96c7aaae599ce1f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03dbd13c-bc99-4388-95c0-bddcf483f594/gatisosijigu.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_1c9a15cfd59141388d24c6f78c7d6959.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/087ec3a6-9999-4ccd-ac6d-f95dba56e183/22014615017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c08b6b-ed94-4bed-93b6-cbb40e5c0e3f/62243931592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106be06f-4fc8-4fd6-980d-49299d2c52c7/binoviromazu.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_1cb2340b721c4fa6b5708ee43e3c457f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nademopor/42422397823.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_e7d30f2eae81427299bd4e77df69e1cb.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_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 5020 bytes
SHA-256: b90803a1fed359b864557411abd0b0cf3a8f9b3868905a095c93c734c8f9c788
font_01_sfnt_off00013e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E79 10640 bytes
SHA-256: d8f3f4226233376d3e2df7bcb168d2cd3e8f25da6691d0e1457965e725be1697