Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f426426897135b…

MALICIOUS

PDF

78.5 KB Created: 2021-03-06 10:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1ae8023548065468d862e137849fcbaf SHA-1: 5f15a762d4cea63feb8f2cd63d7f65deb7a9bf61 SHA-256: 59f426426897135b6a73d3894252decb4c6d999adc3775be3fd0070e086004f5
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 0.9998

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://vilenefex.ru/award?keyword=machiavelli+the+prince+summary+shmoop PDF link annotation
    • https://cdn.sqhk.co/mofijovelu/1u3Mihw/28094036412.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/6490199.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/g6EhbHb/hockey_tops_uk.pdfIn PDF document text
    • https://zogomidovuga.weebly.com/uploads/1/3/1/6/131636914/tudavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485305/normal_5fed247cf009b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_602126601d01f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391327/normal_5fc611470d187.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/0b24d1009788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452626/normal_5ffe20fbb2081.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/xinuwikilesuluz_kokerileg_napulovek.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/95a6f566-0b0c-442c-a497-bc3d14d03479/skyrim_alchemy_easy_recipes.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/11101503573.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/letanias_santo_rosario_catolico_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3741091f-7e65-42e8-bbe7-75cbb9d5075d/the_rabbit_who_wants_to_fall_asleep.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_4f054b84d4cd4a8e97eb7023ff561fc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6e0863-82d9-49f1-a85e-47c749061c23/old_school_classic_cars_for_sale_by_owner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db636f8-688a-45c7-ac29-5f8c0b20bdd7/what_does_the_us_constitution_mean_to_me_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d27d4a5-39a2-4aa5-9150-161d61ff1904/who_was_hae_min_lees_boyfriend_don.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_6f78b5f594d04dcb9c7c0afeec1b0387.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_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 5340 bytes
SHA-256: 7c1664e20d905e9dc501904b536c7094d2a7a80e6205832779892e4f83daba1f
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 10208 bytes
SHA-256: 02ac30d4cabce769b0d4281b7f92bc7747aef20a7c7333fc1f1a9c523518cc3b