Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa707b2cc25e2d1…

MALICIOUS

PDF

79.8 KB Created: 2021-04-06 07:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 607ed781739be0f4afe7e9b7298d8c07 SHA-1: f42b9fe689abe17a2250fa95e2233e9d0f6df5c3 SHA-256: bfa707b2cc25e2d111df7e1ca8db070857d505f2d90c1caf4eaf7fae237d8a52
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains keywords related to academic exams, indicating a lure to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wix?keyword=straighterline+anatomy+and+physiology+2+final+exam+answer+key PDF link annotation
    • http://bagezokazuraw.medianewsonline.com/new_antimalarial_drugs_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_6022c4b0a5de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_6064593834088.pdfIn PDF document text
    • http://lozelenirulotu.22web.org/rosipuzefonipuvinep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_605953d8e606f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5ff45c4171150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff25f65c992a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_5fda297b1829d.pdfIn PDF document text
    • http://tedewirivotu.iblogger.org/824659336.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/36804109113.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/what_is_the_nutcracker_suite_all_about.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_603a6a175f40e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_603160f7aafea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tutunod.epizy.com/66186876851.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/xuxobafesijakubanebavenur.pdfIn PDF document text
    • http://binawojojin.epizy.com/85722418010.pdfIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/refowolavezolovizudezigu.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/mp4_to_avi_converter_apk.pdfIn PDF document text
    • http://fijumusuxolegoj.atwebpages.com/getting_to_know_god_intimately.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/clover_legacy_bootloader_windows.pdfIn PDF document text
    • http://bugifub.epizy.com/kojarovodozebeb.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_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 6016 bytes
SHA-256: 0c6631e14682bf000d40c8abe8d6e27c1c9fe9b56badf5bf9085641607cee1bc
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 11756 bytes
SHA-256: 3a5392ff09b3d900ae1704875bcf7d9b70ffab3e1012f0d629b7c9c5659c1781

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