Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc78804a2fea149…

MALICIOUS

PDF

74.4 KB Created: 2021-05-08 16:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc591dd8a48a126cb7508d0572e37364 SHA-1: 19edff7c333c74b0e9d9f61f035fe9d44345dcd3 SHA-256: dbc78804a2fea14905c2bfda4ddf3f2f97e534a3cdb4a908afab69b1ffd0fd78
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=polaris+ranger+500+wiring+schematic PDF link annotation
    • https://legelopupusida.weebly.com/uploads/1/3/4/3/134350366/e9fd579b640a3c.pdfIn PDF document text
    • http://jalimojaben.iblogger.org/tecnologie_applicate_ai_materiali_e_ai_processi_produttivi_3.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jdejaii/names_of_domestic_animals_and_their_sounds.pdfIn PDF document text
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/9783621.pdfIn PDF document text
    • https://cdn.sqhk.co/nipumusawobo/BjceheP/70924013908.pdfIn PDF document text
    • https://nenojidadexodu.weebly.com/uploads/1/3/4/3/134351563/jixeguv.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/Yij3Gge/i_am_death_incarnate_wolfenstein_the_new_order.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumirukilifu.rf.gd/full_website_er_free.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_0fd966aada134c7b920b3bed650ebe24.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_2388105f6c7c4fddaa03cd6fb0c596dc.pdf?index=trueIn PDF document text
    • https://2bb9e989-9ce9-409f-aa8a-839f2ea8d3bf.filesusr.com/ugd/9f8cc2_b680e4a2e2334fe7a2f6267c3469e616.pdf?index=trueIn PDF document text
    • http://netidufek.rf.gd/administrao_estratgica_e_vantagem_competitiva_barney.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_4f1ecaf99ead433dac4f7f36184217cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e975ec2a-06d4-4dd4-8e5f-a6e91f92c3ec/22100042553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b14708-8b9c-4b4e-88bb-35c100f73b7d/wanoboni.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_270cd14cdfd04a80a8e4f497ec08c190.pdf?index=trueIn PDF document text
    • https://9177b9cb-4c70-42bd-a9e0-27a1bf53b67b.filesusr.com/ugd/9baf76_ccda4fc7342349b396a5ba35664bc8b7.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_02076438b10843b7b24064a3ba6ad3a6.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_f282eb51d6fb435887336b8ce5ff52d8.pdf?index=trueIn PDF document text
    • http://tasanixuzapavo.epizy.com/brche_vergleichen_bung.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_5abe5147a43444a29f84b95ea744381a.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_c9e814d9d58146238e26517922156361.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_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 5572 bytes
SHA-256: 572cbec7d51753c5a9726153cad866393c3bdf55d3114fb5160afaffc986fc86
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 11120 bytes
SHA-256: 4a482b90cc3d5909f78da4ff6aa668fa6af87fbd910dc2b0f5d71671767f3c09