Malicious PDF — malware analysis report

Static analysis result for SHA-256 113ce40de3d107ea…

MALICIOUS

PDF

74.6 KB Created: 2021-03-18 16:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87b298b7241c05e9b373a7fa42dce63f SHA-1: 9b54f6a4c74182d9d3a86ace1b2ab4a0883efa20 SHA-256: 113ce40de3d107eab316549044180d12e7ab15b96e502b7207d69fd9eecc399b
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 0.9991

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://jumiwimov.ru/strik?utm_term=omron+e5cn-q2mt-500+manual PDF link annotation
    • http://freud.icu/how_much_does_a_cracked_heat_exchanger_costp2n6n.pdfIn PDF document text
    • http://ru-1.casa/380919647668humy.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/eluuNge/contents_page_template_ks1.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/ShbiiDa/lewoko.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/daXicW9/merge_quest_blacksmith_event.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/WhdEM4M/minetest_games_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/iif2hgF/xidote.pdfIn PDF document text
    • http://begemotiks.space/82479585611ti68c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_dafe6f75ac384a55aa6f9bcb0643c48b.pdf?index=trueIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_36b32e054ff94d9084aed68f90a862a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavobawum/android_file_transfer_alternative_free_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6658ada-70e6-4640-bca3-71961c18031f/ruckus_prices_in_philippines.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_b4961f3bdccf4443aec1a123bedb170a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/48976647078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28211d8d-2244-475e-adf3-ad4017d7d2e3/dias_festivos_en_enero_2020_mexico.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_1ae4150f8c9c4171a268f55a908f265c.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_0dbeaf42a1604efa84df2ed8cc2b423b.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_89f8fa9386a04e58a081aa6e4ad0d276.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1859c951-8fb0-4250-a288-378d47bebb01/yaesu_857d_radio_for_sale.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_e253f6be77dd4721be5d651791773f3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef395221-8a1b-47b6-aa18-70c94b497b89/how_much_does_a_butterbeer_cost_in_harry_potter.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/free_volleyball_rotation_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/tirop.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/windows_10_getting_started_guide.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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 5352 bytes
SHA-256: 56f9978b8c714223f82db4408b81d320e34db6672ac1d7f3abfd6b9be6d3b681
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 17096 bytes
SHA-256: 22f43f8b1124d459eca8551d2cd04758ffa453e6597cb844de23a8a32c84c832