Malicious PDF — malware analysis report

Static analysis result for SHA-256 16faadb5c9c28973…

MALICIOUS

PDF

72.5 KB Created: 2021-03-31 22:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2796ecb20c4e7effe66443e12de60ae SHA-1: 126eb8ecbddd180c19023b2fe8319fc3158efd54 SHA-256: 16faadb5c9c2897374aa7bcc3e166c3c7789a8ddb31a5fa263e450af99469152
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://lozipotod.ru/award?keyword=adeptus+mechanicus+codex+deutsch+pdf PDF link annotation
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/lififaw.pdfIn PDF document text
    • https://fapopadiwa.weebly.com/uploads/1/3/1/4/131438416/18a9828b3d2fb19.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/excel_vba_user_defined_function_argument_description.pdfIn PDF document text
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/3275615.pdfIn PDF document text
    • https://femulonatif.weebly.com/uploads/1/3/4/5/134501650/guvaga-zafeduz-xojiba-xitig.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/duburodeziso.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/automobile_engineering_books_download.pdfIn PDF document text
    • https://kedinijujad.weebly.com/uploads/1/3/4/8/134884613/2193665.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/likowa-tamoforuv-todafefalenego-fopiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_2678f0429f2c44098ad58657540da089.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_59cc2dc229fa432eb217b922b128ec89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/the_shack_movie_free_mp4_download.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_9dc8663bba1b4a6890fa67f454307198.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosevud/jaundice_in_pediatrics.pdfIn PDF document text
    • http://vusedew.myartsonline.com/gauhati_university_bsc_botany_major_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/substantivos_biformes_e_uniformes_exerccios.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/how_much_is_a_wii_game_at_walmart.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/pabosajixubalib.pdfIn PDF document text
    • http://xifeloj.onlinewebshop.net/br_ambedkar_biography_in_english.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_29401f8f55064cf8a1be2f2cd85f82bf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 3048 bytes
SHA-256: 1892116cda38db3859f3fa98e26e567ac5b36f9dd926533c449d616054d54a90
font_01_sfnt_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 5324 bytes
SHA-256: 5451602d9c9a5fb2aae850a2958a0140b84217f9e47a6731acf2e851456e4cfe
font_02_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 11544 bytes
SHA-256: 4cfba992b9558b58d94c0ecf02705b349b8705b81f551077e99dbdbc28e830a8