Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe7e744c3bb6dca…

MALICIOUS

PDF

76.4 KB Created: 2021-04-28 14:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1bebdac55bea4dd84bed423b9bf2bde SHA-1: e6fa7808157862c3ca86d2979b8f25cd74d325ee SHA-256: dbe7e744c3bb6dca6f40613b511fd5defa965c047aa37d06f26430b10d1b50bb
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-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://bologen.ru/strik?utm_term=how+to+use+a+weightlifting+bench PDF link annotation
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/1a3de97124.pdfIn PDF document text
    • https://suvejeko.weebly.com/uploads/1/3/1/4/131407233/vadurap.pdfIn PDF document text
    • https://kilekefaze.weebly.com/uploads/1/3/4/6/134631798/mufojab.pdfIn PDF document text
    • https://dunujamovexen.weebly.com/uploads/1/3/4/3/134361976/bc7d94.pdfIn PDF document text
    • https://zupeloniz.weebly.com/uploads/1/3/4/0/134018773/d6b216f3b88e10d.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/7330949.pdfIn PDF document text
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/1909838.pdfIn PDF document text
    • https://wavidamos.weebly.com/uploads/1/3/4/3/134316051/doponitejim.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/50894711351d711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_a706bdb85d7349308b25e7e8677db89d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeroguru/agatha_christies_poirot_season_1_episode_1_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/9247853065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b64f46-dc72-48ed-8ee5-c7df0579f3f7/best_32_inch_roku_tvs.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/11505517061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fae11a4-d126-4cd9-9102-5c08ad84a05a/pebawezutovexomi.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_a93ba540f2ce483e9fd8f9de400bd7cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c73da05-516c-4edd-a74a-e9182397c469/66676051131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed3024a-2117-4faa-94d2-f11724b903ac/khairiyat_song_guitar_tabs_single_string.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_d1b4a4cf28cc488c8506b0675b5aeca9.pdf?index=trueIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_011e22abdd354f9d8fbaa4870640f8fd.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_15dbc17995314b4d9970c0c92119eb78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/041d7068-efb8-4258-be67-0069db4d6bfd/the_rising_of_the_shield_hero_season_2_trailer.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_aae413dedfdc4fdfacb6aead37c2d2e2.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_9ecdb66adb5846d1a0dca33e0a070eb6.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_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 5240 bytes
SHA-256: 216828a5dfb93ab92c83096e9767019075fd5eff46c7b556589dd9ed80274b58
font_01_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 10972 bytes
SHA-256: b9207626ee42256cd529e131c0831aad2e6480025197a0e4cf404fb6916ea09c