Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7870b3a27a69cb0…

MALICIOUS

PDF

111.6 KB Created: 2021-04-06 13:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b0d6633626ce76f5fbae3ae50e39d947 SHA-1: 6c96abe3506e18f21665b6d07a45dde44d536c0d SHA-256: e7870b3a27a69cb0936264ebf0a574999ef5b86b3aa8b3038a7b5aa1e4425564
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=code+de+l+urbanisme+algerie+pdf PDF link annotation
    • https://vegirizekor.weebly.com/uploads/1/3/1/4/131407876/4112691.pdfIn PDF document text
    • https://gebedosoxabitox.weebly.com/uploads/1/3/5/3/135324181/c8d333.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/supatetefidujaru.pdfIn PDF document text
    • https://rekeboko.weebly.com/uploads/1/3/4/8/134899800/vagiletusokejutojajo.pdfIn PDF document text
    • https://zoluvurodozi.weebly.com/uploads/1/3/0/7/130776250/vodapefimov.pdfIn PDF document text
    • http://viximer.iblogger.org/zerumemuze.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/185a2619.pdfIn PDF document text
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/2524531.pdfIn PDF document text
    • https://wunebometa.weebly.com/uploads/1/3/5/3/135314425/4738007.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/dutikuwu_kolosek_libip_wolafawakazubej.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/hHOHEhc/all_social_media_in_one_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/cRiijgG/gangs_of_new_york_butcher_quotes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosafaw.rf.gd/gaxule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e535e61-729e-49cf-9505-e2c59ba06291/41934879238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e751b55-d8ee-4d3b-bb29-0a38013b5b6c/96306034957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e592662c-abf8-47d8-a31c-a5c73d56ed89/zasinifojepozofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdd750a-85f7-4937-8719-30b35080a960/bogibefe.pdfIn PDF document text
    • http://defipezisezujor.rf.gd/german_imperative_form_kommen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee07b627-990a-4c17-9e8d-02b7da19a582/79230129723.pdfIn PDF document text
    • http://sagavaxedowuviv.epizy.com/fundamentals_of_3d_food_printing_and_applications_download.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00017d02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17D02 28576 bytes
SHA-256: aab2463689e8b375b602c877da043f8267d0fd99739d1ffc55d3e3cbeda4ca4d
font_00_sfnt_off0001431b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431B 5404 bytes
SHA-256: dd0a75921356b81332db7b07a53817f6e4a7079d648cdcc43d862ba3e48b8173
font_01_sfnt_off00015555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15555 12628 bytes
SHA-256: 2bdbd89b1f2746b380b312c784bdecdbac3ab7758a83739dca680fecb83ffd92