Malicious PDF — malware analysis report

Static analysis result for SHA-256 875d9ff11ec4c537…

MALICIOUS

PDF

70.7 KB Created: 2021-03-16 07:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be554da8c448bcec04149f5ab60701b8 SHA-1: 569d210f3206a6622b1e008a8c9da419ccc33fdc SHA-256: 875d9ff11ec4c5371eec10a507dd3f20eb8e65c0bb44771fdf14adbee2b8bc54
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-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://fokemale.ru/strik?utm_term=ingles+basico+a+ghio+d+audio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371244/normal_6008ece2c11ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_602a6d40b03b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5ffc4e0055594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502698/normal_6007eab4bfcec.pdfIn PDF document text
    • http://epipog.com/21840702794w08wp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470703/normal_5ff504a340316.pdfIn PDF document text
    • http://f13x.xyz/57794120588n33op.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/ade77feb-1218-4cf2-8245-d160237c7243/what_is_the_best_air_frying_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c90d875-3333-49b3-a1bd-0ee4474103f9/how_much_does_it_cost_to_ship_internationally_with_fedex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1a6944-ef93-42e5-9eee-58788fb97a42/martin_luther_king_jrs_i_have_a_dream_speech.pdfIn PDF document text
    • http://xedekig.rf.gd/67094222918.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_93c6826a9d634ad1b9a1790a62f29727.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9303f010-d168-47c5-a7b6-f0dd92b05686/we_the_animals_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/094cb4bc-50d2-4bc8-8334-35efb452888f/whirlpool_d10_water_cooler_parts.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_9029e636bc0941a0b444d6c8879bd2fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/468a14b8-c146-457e-a93a-0ee0c5b658de/how_to_google_search_a_picture_on_iphone.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_1d375311d48e4fd3a5fd669af83fe47d.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_71fd1823fa6b437d964f1434755ac89a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff9cfdc-7089-4b6e-97a5-f029d66f3825/68025400001.pdfIn PDF document text
    • http://ruvosetozobeve.epizy.com/gazibuvokezinokuku.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_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 5184 bytes
SHA-256: d91e28a6d5e1fb554f52472273ef1c7db854ad5ca4febee2e9bace5e160337ca
font_01_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 11356 bytes
SHA-256: 0e3d5e58a8766ccd1b4560d843cf30a6ad32179bec82c194d65a5312698e8355