Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d11d578510b1d16…

MALICIOUS

PDF

40.4 KB Created: 2020-11-06 00:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ad99354aee292f1ecece70f4e99693cb SHA-1: 2d2cae070edc27ba0f99723c86534fd1bc6acb17 SHA-256: 1d11d578510b1d16eac68f317279dd57906b04c0cb872ccf3878a0fd22f7fb4f
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffe.ru/strik?keyword=making+predictions+worksheet+1st+grade PDF link annotation
    • https://zuverefexogi.weebly.com/uploads/1/3/4/3/134316215/sununesonam.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/nuxesididitogeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_5fa19c40a317b.pdfIn PDF document text
    • https://molozotupinomel.weebly.com/uploads/1/3/4/3/134340336/5329890.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/dowodegefavete.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/1338940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5f8b4fc84c9aa.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/mujevubutukoxu/practice_it_answers_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7363af-2698-4596-b326-4e685b56184f/pk_trke_dublaj_indir_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/adverbs_worksheets_for_grade_5_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/swords_and_sandals_2_emperors_reign_hacked_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc04c0e3-ab40-4d36-92e7-9af0f02fb21b/jisojulanosevesojepibu.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/72617250411.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_off00005beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEB 5516 bytes
SHA-256: 59bbb2e181d2b9a4bcf35d66e8fe53d08877cf359a82b5181d7f77b5cb025267
font_01_sfnt_off00006ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 11200 bytes
SHA-256: f31bec2f92acbc6d0fbd3bb7957d382f8f3ad53982d212cff8e5fe74b5ae3fa5