Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5ed586663ed430…

MALICIOUS

PDF

88.0 KB Created: 2021-05-10 12:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 062dc5333d45e73a8f0d9f7ab7d49543 SHA-1: fc159115cd7bc424932249b860b94f9850437cc5 SHA-256: 4b5ed586663ed43083b8f4ceec3437a1b87f0537df2c60ecf53051c6927860a7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/wb?keyword=oracle%2012c%20rac%20installation%20on%20linux%20step%20by%20step%20pdf PDF link annotation
    • http://jemulobapamiwu.mywebcommunity.org/fiwigomobikeginolo.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/giiaigp/anime_stickers_for_whatsapp_apk_download.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/3532063501d75f.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/automate_the_boring_stuff_with_python_ebook.pdfIn PDF document text
    • https://fedusinejedutim.weebly.com/uploads/1/3/4/0/134040989/4582997.pdfIn PDF document text
    • https://vomodubezu.weebly.com/uploads/1/3/5/3/135398809/4059569.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/NuIgjjh/prehistoric_park_builder_mod_unlimited_money.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/263135.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/vitamin_c_rich_foods_list.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/gelIQIW/the_maze_runner_full_movie_youtube.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/dedax.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/g1G2hhh/gsea_ranked_lists.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/784396.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/kapuviwatiboreboboso.pdfIn PDF document text
    • http://numulul.mygamesonline.org/process_of_fertilization_in_plants.pdfIn PDF document text
    • http://xebupado.mypressonline.com/lookup_reference_formulas_in_excel_2020.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/vokategokow.pdfIn PDF document text
    • https://filinisosiwox.weebly.com/uploads/1/3/0/8/130814007/bavesaro.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/razetuwazev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/ezgo_marathon_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/how_to_politely_say_no_to_mlm.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/dell_optiplex_755_vga_drivers_for_windows_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/viludesalefiwezijovomu.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/vekuwubu.pdfIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/tabla_pulgadas_a_centimetros.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_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 5668 bytes
SHA-256: dc8bdddb2a7e25978bc6cdf6911e2ee6bcb063000d0dda3225bd811dba5aa362
font_01_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 11016 bytes
SHA-256: ad3131e7536a1b04e9cf2aa0045e1abe99aa8a9547194da3fd54221277003534