Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c96383fdaedb86…

MALICIOUS

PDF

74.2 KB Created: 2021-02-28 04:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fcfe3c9e30a00c618d526cb70a427d05 SHA-1: 3807a64d8a160b1d98fd9cb779e7722449110622 SHA-256: 76c96383fdaedb86ff050d4283611b2d9226d06785debedecdcf4e91ab057f87
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL suggesting a search result or download lure. The heuristic findings indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=descargar+la+fe+de+jesus+adventista PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391921/normal_602c9effb5ac7.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/joluzanaredoj-zetatozofaxajav-narijonufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fe19e909ac4c.pdfIn PDF document text
    • http://wejnpowk.space/54788157049blqf5.pdfIn PDF document text
    • http://tonagruz.ru/duvet_cover_sheet_definitionezfbg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fe4175d1415b.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/what_is_the_least_expensive_dish_network_package.pdfIn PDF document text
    • http://hookup154.fun/my_stella_knights_guider8i2c.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/nerugiraxura/mupitaduvewezesedazidapi.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/1_centmetro_cbico_cuantos_mililitros_son.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/guitar_tabs_lick_it_up_kiss.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 5324 bytes
SHA-256: 3d37cf0bff0625bf8d7d54879ecfad8343a5d747e586ed4357a2406885bdd330
font_02_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 2460 bytes
SHA-256: 34101755c0a858db84613f6e6b1707ecd3ba29c84cfe34949d8461ab445b3660
font_03_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10108 bytes
SHA-256: 32ca872db3ddcb871e41c05f9683ab6c723b3442342eadffc049765ecdd55927

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