Malicious PDF — malware analysis report

Static analysis result for SHA-256 3645b44255ab84a8…

MALICIOUS

PDF

89.5 KB Created: 2021-03-20 10:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b7d39be1eefa40f7f5334606866f4394 SHA-1: 9d10d7ba84c158d179adb06765fc2bf918556b48 SHA-256: 3645b44255ab84a828b19a79715e46250e3489ded640292fd2d4a349b3ba8a93
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=stihl+039+farm+boss+chainsaw+manual PDF link annotation
    • http://cheapestshop.xyz/kakasokamezuganuvikejazugkysnk.pdfIn PDF document text
    • http://creditscoreusa.info/what_does_yo_tengo_tu_amor_mean2lq29.pdfIn PDF document text
    • http://true-board1.club/52225700787mmvps.pdfIn PDF document text
    • http://select-get.top/11869416777bxa6i.pdfIn PDF document text
    • http://geleostone.online/uk_film_box_office_top_105icib.pdfIn PDF document text
    • http://pl50off.info/56192670208yzfgs.pdfIn PDF document text
    • http://huseyincanx.com/43732334271pc7xw.pdfIn PDF document text
    • http://khanapoorti.com/keurig_2.0_regular_coffee_machinegyab4.pdfIn PDF document text
    • http://mbfsopg.com/voodoo_lab_pedal_power_2_plus_australiah8l6t.pdfIn PDF document text
    • http://shopyou.online/what_is_the_ratio_of_m25_concretey7tw4.pdfIn PDF document text
    • http://bigmagazin.xyz/chloroethane_staggered_conformation_point_groupxrmkp.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/a76b38eb-3aa9-4f58-bfaf-c229681d9214/xedos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f337bbd-62f5-4190-90de-687470c1bf31/use_the_4-7-8_breathing_method.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5414d8-4588-4d3b-a852-61ff30d74108/84255725771.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_e5c869c32efa4f5fa5680220db660970.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_c741e4f9b4ad498e8d68082dc7b3d3a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea12adb9-dff1-4c19-a3de-00beea89e093/xosibarawiregusanoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe1a479-aef1-4781-8faa-a298669e70ee/954628765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c191e2f-0e97-4995-9aca-1fe9af1436ba/the_filmmakers_handbook_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9586fd-5750-4fcf-a353-e6a6fd1464d8/multiplying_decimals_word_problems_year_6.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 5916 bytes
SHA-256: 1b6f4f9f0fe98868f02af09c95d38345016fd6954b5f96c32a89993c014243e4
font_01_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 10532 bytes
SHA-256: cb14733b3f4e6a0da94376156068d878238cf14458404d86e25069d51369d0c3
font_02_sfnt_off000142ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EC 16244 bytes
SHA-256: 37bd064822a4139c5d8e3cdb2e2dd8d0ae9d956962f76839c9edaf1267f3d3f3