Malicious PDF — malware analysis report

Static analysis result for SHA-256 271c9466d9ee8de7…

MALICIOUS

PDF

74.1 KB Created: 2021-02-17 06:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 374f1dc2dc577a039848db8b0a08f037 SHA-1: a8629eaa778d9f04e21a37efb6e1dd07ee20247c SHA-256: 271c9466d9ee8de7912cd10a8d317bcb09118a3cf0adf3fba78f20a9056b10f2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or to distribute further malware. Although no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites.

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
  • 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://bologen.ru/123?utm_term=do+you+capitalize+student+council PDF link annotation
    • https://notovozeje.weebly.com/uploads/1/3/1/3/131379031/9696349.pdfIn PDF document text
    • http://ketousa.site/64850179836aoeab.pdfIn PDF document text
    • http://copyrighthelpcentral.com/grammatical_structures_in_english1afab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5ff2bd5066034.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/hbgggez/adventures_of_tom_sawyer_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464311/normal_600209929e3ef.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/wgegeJJ/street_fighter_4_champion_edition_android_apk_full.pdfIn PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/fadiwefelivewiv.pdfIn PDF document text
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/venubemo_sazulojigosun.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/jaoghjh/mopria_print_service_ios.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/2889294.pdfIn PDF document text
    • http://ijmalan.xyz/2929842707x7mk3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 5004 bytes
SHA-256: ca9f34a6465b38660094d2b1f998a3c14d7d81c0945724e1569100018d0279c9
font_01_sfnt_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 10952 bytes
SHA-256: 623dde2eef6d78fef56fe8c157d90a7c0290174c60cc17584738f11850e3f53f
font_02_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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