Malicious PDF — malware analysis report

Static analysis result for SHA-256 4524a1c35d8dc16d…

MALICIOUS

PDF

81.3 KB Created: 2021-03-19 17:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0fb7357d6e09a246eee23e262238f589 SHA-1: 5199795219211f4107de633d2390b578f6a375f5 SHA-256: 4524a1c35d8dc16db99413cbc7bf8782f443b0bca1596e7704d6e546904c2ab2
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 0.9991

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://jottigo.ru/wix?keyword=hatchet+study+guide+mcgraw+hill+answers PDF link annotation
    • https://cdn.sqhk.co/jekuvobu/niaifbj/business_turnaround_strategy_template_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/nofoxanu/hhojjhe/happy_birthday_cake_photo_for_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/0lhhsji/kugesitodidapujuzi.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/bonorinadafibawiwidenor.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/ic6fhkw/josubuta.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/pp5jdSL/download_racing_fever_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/0jjYIWT/61347993005.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/gcgfBgd/crowdtangle_chrome_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/hhcgdqr/21160127069.pdfIn PDF document text
    • https://cdn.sqhk.co/xevezele/gcjeaji/human_resource_management_certificate_online_alberta.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/ib5jbid/new_ice_cream_flavors_at_walmart.pdfIn PDF document text
    • http://jewagep.22web.org/44280716022.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/SiaWnTH/dagezi.pdfIn PDF document text
    • http://wemuwugisenoro.iblogger.org/how_to_factory_reset_adt_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/bimerolu/KhbTjfE/50342193303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_bd9321a00d844ccebf2de6c547783c92.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_e815b732c7b1437c943f91a95e4291ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/convert_xls_to_multiple_sheets.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_b3057f7718514c0e8667a518e27c871a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/who_auditioned_for_the_notebook.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/baby_crib_sheet_protector.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_177ab5c05669431d9f8f7f60a5fb93d8.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_8ee645209a3f4358afa9ebbb7d588f6a.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 5508 bytes
SHA-256: 0df68e43ca54b156a826500b0fafba525d8caffc3b5dfca4a6a7c0789cd9bd4e
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 11040 bytes
SHA-256: 93e0cedd2d8e8eabf3b68cf3d78d058a7249fd23c0e265728c1274f6da561217
font_02_sfnt_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf