Malicious PDF — malware analysis report

Static analysis result for SHA-256 420c5d6760b8247a…

MALICIOUS

PDF

92.0 KB Created: 2021-03-28 13:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 24c8f490923d845c0d18cedf6b8797f9 SHA-1: deb8d81c30d6bdb98f9ae3c185a180c5005e5f9b SHA-256: 420c5d6760b8247a7eae13f54521f5229b3a7574500aa923acf8e0879ecb4615
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=mystic+messenger+christmas+dlc+hourglass+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469827/normal_5ffa3d4cd1564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fd0dca8af3a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fd28455eb920.pdfIn PDF document text
    • http://bupro.asia/936603818575n07y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_60411559eb9f2.pdfIn PDF document text
    • http://shopsmmv.site/braun_series_9_9390cc_latest_generation_electric_shaver_clean_and_charge_stationeh3o4.pdfIn PDF document text
    • http://sexedate69.site/20002938572g56us.pdfIn PDF document text
    • http://tututot.mygamesonline.org/art_and_craft_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_6014486a5cd00.pdfIn PDF document text
    • http://nextauto02.ru/67996773042rl116.pdfIn PDF document text
    • http://teenagetutor.net/male_style_guidehvea5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/65648836956.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/2004_ford_focus_wagon_se.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c97f4c8e-18c5-40fa-887d-b8e6ebc61510/hp_officejet_4500_printer_setup_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b983e6-a01b-4deb-81ba-2ec15924ee15/power_acoustik_pd-931nb_manual.pdfIn PDF document text
    • http://xedemigu.atwebpages.com/life_insurance_definition.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/32305479293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06bd640-aa47-4d7f-a6a8-30567a82e48e/gebabevubotozizenet.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_7caac7a499474dd1b07cf5d1455a4aa1.pdf?index=trueIn PDF document text
    • http://vigexosav.myartsonline.com/jajujedusevilewos.pdfIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_6102c0fcf71042e094ff8e04fe49d3c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifamomove/vernier_callipers_worksheet.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_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 5460 bytes
SHA-256: b25f490573185ee2b988a054e4fad5c90e742d50818f100b18027f9b7eba44ac
font_01_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 11540 bytes
SHA-256: 8ca79553f2e05d78a5a2bd08a3398e59489ef04b6c1fb29dcca662f0a7a88e18
font_03_sfnt_off00014ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA3 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848