Malicious PDF — malware analysis report

Static analysis result for SHA-256 b973f09ad11c5800…

MALICIOUS

PDF

75.3 KB Created: 2021-05-15 13:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 47d2a29283870e5dca0ca75e6b42ae96 SHA-1: 7a1771525b3d52a286ca53c6709d829b0feb287a SHA-256: b973f09ad11c5800960227757c960ff95b3503c2d4729e930c6741efac78e593
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the nature of the URLs and the ML detection suggest a phishing or malware distribution vector.

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://dugedepap.ru/strik?utm_term=the+mysterious+benedict+society+series+list+in+order PDF link annotation
    • https://gifiboluf.weebly.com/uploads/1/3/2/6/132681188/mavososoduxuw.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/elements_of_acoustic_phonetics_peter_ladefoged.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/murepokolukokolewis.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/1975837.pdfIn PDF document text
    • http://sibasijiv.22web.org/philippine_independence_day_celebration_narrative_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_601e2c3315399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427509/normal_5fdfc9a24b431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475988/normal_6004c0989922d.pdfIn PDF document text
    • http://gakesatigefa.22web.org/como_hacer_bomba_de_ariete.pdfIn PDF document text
    • http://bitiwiz.medianewsonline.com/9305975131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459640/normal_5feb9aef0a7f8.pdfIn PDF document text
    • http://pukutabutosu.22web.org/19222038050.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/agregao_pedaggica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisogifamesada.epizy.com/natewemetot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f33ba2-6c45-4def-a412-b9a1ba0a988e/how_to_turn_off_demo_mode_on_sony_stereo.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/christian_songs_flute_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/tekitipajiwegavoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a228915-224a-4aee-acc4-c212564e5707/is_adobe_premiere_pro_free_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/how_to_turn_on_vivint_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ab3ff2-ac48-41a4-9f81-e64a3c77a5db/joladumifizame.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/bundle_of_joy_sheet_music.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_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 5160 bytes
SHA-256: 65776751cd95e6a66e2b87b702e90077a68e481e4a7d5cb8c7474096458d28f8
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10552 bytes
SHA-256: caa47492ce3c1dda81d522951d88b26b0db8d88ce0a54d851e6e4575183ab678

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