Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2db3b40376b009…

MALICIOUS

PDF

74.7 KB Created: 2021-03-16 21:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ccc4846c80dffa2d3b27ba37e14574b8 SHA-1: 167b6283c2c82f2a6259820083eee7226f38d5df SHA-256: 8b2db3b40376b0093e4ddbf52d5ffd0848e75089836cd5156705812a1b2c83c4
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the presence of embedded URLs suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/wix?keyword=gattaca+movie+assignment+answer+sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5ffb20a257312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fd6292231193.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/adhd_test_for_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_60209398c444f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_602e381a05f89.pdfIn PDF document text
    • http://ramosek.iblogger.org/kipoxobugul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_601f5749eabbb.pdfIn PDF document text
    • http://xipelosowux.22web.org/insertion_sort_in_data_structure.pdfIn PDF document text
    • http://jovuzutijokene.iblogger.org/rabbits_digging_holes_in_my_yard.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/logitech_-_harmony_elite_remote_control_and_smart_hub_review.pdfIn PDF document text
    • http://sawelob.22web.org/how_to_use_cricut_adhesive_backed_vinyl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_6011c3659073c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_602b240d629d3.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://remosinidad.rf.gd/voposuli.pdfIn PDF document text
    • http://pajupevezujugut.atwebpages.com/dainik_bhaskar_epaper_bhopal.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/97175873775.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/71128998182.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/veritas_hand_saw_file_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/sensoji_temple_japan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/rawiwigepitebi.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/amma_ninna_edeyaladalli_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/avery_labels_printing_template_l7161.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 5152 bytes
SHA-256: e37f271c9162b73bc9aac49c9c6863d78d6435eb69d3ec0c27156f1b6c4a0c2d
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 10896 bytes
SHA-256: 6e0411fb5806a59f1e92b120b9aa4b623fc44d0fe5e445f71cfe37f6f96c69f7
font_02_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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