Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b64b43239d647a…

MALICIOUS

PDF

95.1 KB Created: 2021-03-18 23:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 56caa7fce93fe26098b4f351eeaef2c7 SHA-1: 352ca14010b6cfe38255cd01be152ec918bbfa27 SHA-256: d7b64b43239d647acb8cbd48252d10d25c2ced03c2f7f9432e94f78b48709f9b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a link farm, with one URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful content or facilitate further exploitation.

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://maypoin.ru/award?keyword=avner+friedman+advanced+calculus+pdf PDF link annotation
    • https://sotugipuzelaj.weebly.com/uploads/1/3/0/7/130738723/zimaxederuxebe.pdfIn PDF document text
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/levamikukapudef-vuwesajobilupi-sotajorezeg-misisopemaduloj.pdfIn PDF document text
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/pinabilefadab_fokezanuzijiw.pdfIn PDF document text
    • https://tevukebejesa.weebly.com/uploads/1/3/2/6/132695492/zofonepal.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/6795098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_5ffcd2003a35c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_604e0dd96ef51.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/9a7cd76da17c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470703/normal_5ff06689785d3.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/wulagisi/wafiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72fd52a-6344-46a2-95d1-52c423f8ff34/unlimited_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/24595646708.pdfIn PDF document text
    • http://kifarir.rf.gd/zadijalawora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308b72c8-8d25-4243-a7d7-8453643d695b/how_much_is_my_new_home_sewing_machine_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14edd932-8320-4585-a335-7bc40333c5d8/ernest_hemingway_a_biography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca44a13-51d0-42d5-98a6-77261e03b914/76454250887.pdfIn PDF document text
    • http://likitikovewepit.rf.gd/dometic_fan_tastic_vent_7350.pdfIn PDF document text
    • http://nadanopo.rf.gd/bawutimi.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/yowhatsapp_apk_2019_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59b8056-3cd0-41b6-8c7f-bb3a01d291da/how_much_do_program_specialist_make.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 5352 bytes
SHA-256: 8049d7f03e44341e6eae1344976dcac8b0b77d8c7ef9909e81d2da2098b10d0c
font_01_sfnt_off00012ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 13228 bytes
SHA-256: 460ff16c0130b7d8cbdeffc50297b4d8f48dc13cda470db013994551d26c25a1
font_02_sfnt_off000159ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BA 16144 bytes
SHA-256: fb10e5badbbf29d6a05184c763452604a6d256f7c208a2bb674868c670b14a78