Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77e42ae7756df6d…

MALICIOUS

PDF

69.9 KB Created: 2021-01-17 17:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b0cc0c2ae544dc31949cc60c67351de7 SHA-1: 03f68771a59bffeffa8f878b7cc7c67fa96f44f2 SHA-256: a77e42ae7756df6d46e9a9e2ac87eb4768c9144b07b0b47e895d1ba48a15d748
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'study guide download'. The presence of numerous links on disposable hosting further supports a phishing or redirection scheme. No scripts were extracted, but the overall structure and URL analysis strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=mcsa+windows+server+2016+complete+study+guide+pdf+download In PDF document text
    • https://cdn.sqhk.co/kolokejo/hciajhS/best_costa_rica_resorts_for_families.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/eOIfcMA/flying_penguins_bbc_news.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_5fd7c0fbc86e7.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/cgIgioH/89421793779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418993/normal_5fec8aaa1c086.pdfIn PDF document text
    • http://kirunag.66ghz.com/video_avenged_sevenfold_afterlife_live_lbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ffd19f7238e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487897/normal_5fbeb4a53afd7.pdfIn PDF document text
    • http://naderuromopuru.22web.org/sigidikuvokutiboba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5f8e3564a3ca5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449783/normal_5feb4b22e7f29.pdfIn PDF document text
    • https://cdn.sqhk.co/wokiwife/vgcyQXB/car_mechanic_simulator_ps4_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5fb8cc81916c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vukigopi.rf.gd/adjective_worksheet_for_class_5th.pdfIn PDF document text
    • http://kujafugakare.epizy.com/miwidodezebarodedokub.pdfIn PDF document text
    • http://kedekivotizera.epizy.com/free_math_problem_solving_worksheets_grade_1.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 6212 bytes
SHA-256: c7e1b412dce1a3a8b4f1fbf7cc1a2f75f6b26eb8fd3c6ec5a83f9af18e6389e5
font_01_sfnt_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 13848 bytes
SHA-256: 80d3c4b87a9d67dea3dedee017ce98fda78589a44c4591ab53af9ca523c3c6a7

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