Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de675b672714a73…

MALICIOUS

PDF

107.1 KB Created: 2021-05-19 12:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41388a003b2ece45c320abe2cba194a5 SHA-1: 967044df40ebd21099ed28c9a9306599dc5ea787 SHA-256: 3de675b672714a73e34db93dd58370b4d074131beab3227dd500922b40b87044
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 0.9976

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://druttle.ru/strik?utm_term=manuale+nissan+qashqai+2020+italiano+pdf PDF link annotation
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/pitavikox_xenapalot_fanujisitaxen_fozibazurizis.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/melisi.pdfIn PDF document text
    • https://nokuzase.weebly.com/uploads/1/3/4/7/134765685/6267200.pdfIn PDF document text
    • https://dosasefezopalan.weebly.com/uploads/1/3/1/3/131398547/navujurebeze_lotibekow_volaken.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/1155648.pdfIn PDF document text
    • https://nozirokopen.weebly.com/uploads/1/3/4/6/134613575/direpo.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/sanuzosekep.pdfIn PDF document text
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/zezepipuranige_tepujave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_603074401f16f.pdfIn PDF document text
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/zebulovufu.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/paroruk.pdfIn PDF document text
    • https://dopolijakom.weebly.com/uploads/1/3/4/5/134527788/rofuloxogifux-vunojevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fe9266173877.pdfIn PDF document text
    • https://bedexupef.weebly.com/uploads/1/3/0/7/130775630/xodukururuzewex-leluwebifudazi.pdfIn PDF document text
    • https://dinidoleto.weebly.com/uploads/1/3/0/9/130969871/3596132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_6057bf5285c45.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/25e51708-56be-46d5-bea3-83722cea2eec/the_adventures_of_sherlock_holmes_1939_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/chromosome_abnormalities_and_genetic_counseling_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78d1dbe-900b-4619-abd4-d8ebb78bab7b/18329654117.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/bugigojofolusibifuras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28dcd43b-a332-4cf2-bca7-5d52e75538c6/59733549297.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/nccn_guidelines_clear_cell_carcinoma.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/carer_allowance_form_medical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f197bc5-e6c7-457f-8831-066bcf7cf4ee/the_naturals_series_book_5.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C30 4176 bytes
SHA-256: 006742282422a53fc3a818808d3030fcdb986ae7d331b799d7731c331a2fd528
font_01_sfnt_off00014ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE9 5440 bytes
SHA-256: 700a91c09505887a56c008e8ea8a8818b782f12620643ab223ad2c6f087e75f7
font_02_sfnt_off00015d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D72 12868 bytes
SHA-256: 0094391c7373f083fa5e4dade39b4cb61ce12be193517f07c02b20df89e3880b
font_03_sfnt_off000187a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187A5 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727