Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc80072d32d27d26…

MALICIOUS

PDF

85.1 KB Created: 2021-02-23 04:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 193b47d222ce40fe87f5da75f28c2d64 SHA-1: 1cbdc00fe45991c0dbd6a1d66b771c10f5c0e77f SHA-256: fc80072d32d27d26333dfe3926c6778af0b3ac4ffba0f7ffcebf8e9cb46a7193
186 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a brand-impersonation credential phishing lure, specifically impersonating Facebook. It utilizes a redirector URL to lead users to a malicious PDF hosted on a disposable domain, likely to harvest credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mowexenasa.weebly.com/uploads/1/3/2/8/132815879/talej_vewefomorek_towameligip_buwiwisobibe.pdf.
  • 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/aws?utm_term=theoretical+framework+in+social+work+research PDF link annotation
    • http://rixegubinufu.iblogger.org/75534000203.pdfIn PDF document text
    • http://favowavuwoxi.iblogger.org/what_kind_of_oil_does_a_2006_dodge_stratus_take.pdfIn PDF document text
    • http://jarobadut.22web.org/18209445217.pdfIn PDF document text
    • http://zagavuxowipoj.22web.org/57352176190.pdfIn PDF document text
    • http://mojamozegibobav.22web.org/foxoteviv.pdfIn PDF document text
    • https://mowexenasa.weebly.com/uploads/1/3/2/8/132815879/talej_vewefomorek_towameligip_buwiwisobibe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jusowegakero.epizy.com/king_size_platform_bed_near_me.pdfIn PDF document text
    • http://naxezutozotos.rf.gd/run_android_sdk_manager_linux.pdfIn PDF document text
    • http://dalotidel.epizy.com/45508717335.pdfIn PDF document text
    • http://kazivaf.epizy.com/how_much_do_hot_springs_hot_tubs_cost.pdfIn PDF document text
    • http://jewabavetedow.epizy.com/annotate_apple_pencil.pdfIn PDF document text
    • http://dulubuli.rf.gd/divorce_agreement_template_singapore.pdfIn PDF document text
    • http://borowif.epizy.com/dremel_395_accessories.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/47830578493.pdfIn PDF document text
    • http://kavexuvosa.epizy.com/buvowup.pdfIn PDF document text
    • http://nugopedivewe.rf.gd/oster_22_quart_roaster_oven_instructions.pdfIn PDF document text
    • http://vutakeba.epizy.com/58495074447.pdfIn PDF document text
    • http://rimiwomo.epizy.com/vesovifaxamabutawu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 5228 bytes
SHA-256: c76fdbe7863f631833b3c5f59218f356a37c2af861ecfa0b0b7de7ca7ac5d481
font_01_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 10780 bytes
SHA-256: 24ebed1a83de5c230a534324f702018a269128ceba944b632bceb3744f323b5a