Malicious PDF — malware analysis report

Static analysis result for SHA-256 de639bd75fce4bb0…

MALICIOUS

PDF

73.9 KB Created: 2021-03-19 00:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1b7813d6c4f5a814faa9e03ea4f3c26d SHA-1: c8e6e046814151e6db4970291a55c317ccbad685 SHA-256: de639bd75fce4bb0e99053167a2214fd39f3c33d24f201070e25fd83e909ebb9
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and potentially phishing-related. It contains numerous embedded URLs, with at least one pointing to a domain associated with malware distribution. The document body, though heavily obfuscated, contains keywords related to certificates and samples, suggesting a lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://fokemale.ru/award?keyword=computer+certificate+sample+pdf PDF link annotation
    • https://mulaxenowaw.weebly.com/uploads/1/3/4/8/134862071/9b64040155b04.pdfIn PDF document text
    • http://videohost.space/ibps_clerk_syllabus448sl.pdfIn PDF document text
    • http://freehookup.xyz/sokuvugitodojh3hc0.pdfIn PDF document text
    • https://dukupifit.weebly.com/uploads/1/3/0/7/130775427/4223603.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/should_internet_be_capitalized.pdfIn PDF document text
    • http://nonoxutiwi.mypressonline.com/compressed_air_system_design_handbook.pdfIn PDF document text
    • https://kotedeturu.weebly.com/uploads/1/3/1/6/131606402/4734407.pdfIn PDF document text
    • https://xarupasate.weebly.com/uploads/1/3/6/0/136055515/c5d69a.pdfIn PDF document text
    • http://nunedarozozo.22web.org/67164244233.pdfIn PDF document text
    • http://nnorm-id.com/how_to_install_honeywell_wifi_thermostat_with_only_2_wiresdxlu9.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/tratamiento_fisioterapeutico_para_hernia_discal_lumbar.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/why_is_my_ipod_4_not_charginggah69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofujuwo.onlinewebshop.net/the_social_learning_theory_of_aggression_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f014de7d-bd85-49f0-a7de-c2e77f09b260/rikijonojusovuvubelexim.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/5582938129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff40704-3ae7-471b-ae05-b13b54e4d8f8/fonobemiva.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/bosch_built_in_microwave_oven_manual.pdfIn PDF document text
    • http://zopefunexot.epizy.com/35345502812.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/gsheet_file_view.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcfb6d1c-b8d5-43ef-b8d8-b84433d49642/sugar_free_biscuits_name_list.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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 5208 bytes
SHA-256: 79cdb4bd951486838bed66cbccee521f842664aac2909b525667fae817be3d31
font_01_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 10492 bytes
SHA-256: ba112bdbb40dc63cbf62185479563061e87fabc68c02888b8b582ce64da3daac

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