Malicious PDF — malware analysis report

Static analysis result for SHA-256 31317c9f05efe90a…

MALICIOUS

PDF

76.2 KB Created: 2021-02-16 20:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e0e3ebf86c83d534848dbdbf7c60f1cd SHA-1: 52adc2b3955f075dc283721aaedfe9a7c4a41cf7 SHA-256: 31317c9f05efe90acd3a7bdb5390fbde6ef6bcaf534186ad95d3f31e15ab0f11
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm. The primary external URI points to a URL that includes a keyword search, suggesting a phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and extensive linking behavior are indicative of malicious intent, likely to drive traffic to malicious sites or engage in SEO manipulation for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wb?keyword=easy%20touch%20test%20strips%20walmart PDF link annotation
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/300d27393517bad.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/jiifInH/ringtones_download_mp3_telugu_songs_love_mobcup.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/Obihyjd/jolly_days_farm_time_management_games_farm_game.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/03812afe73288f.pdfIn PDF document text
    • https://cdn.sqhk.co/buganixezu/ihhiegj/dj_marshmello_songs_rooftops.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/eqhcKib/cake_decorating_classes_online_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/jc5Tgiy/warplanes_ww2_dogfight_switch_review.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/h5Ieimu/wijekafukofiluxi.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/gc8jcqi/mod_sonic_skins_for_minecraft_1._12._2.pdfIn PDF document text
    • https://lasuzolus.weebly.com/uploads/1/3/5/3/135315371/zupawen.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
    • https://s3.amazonaws.com/fonibinaraj/promissory_note_legal_forms_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/baby_gender_reveal_sheet_cake_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/liwuxogupawebivolinox.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/kilelelevo.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/accommodation_form_student_information_ielts_listening_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/gowutasul.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/apc_smart_ups_c1000_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/nepoji.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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 5100 bytes
SHA-256: 5d01af4b3ea38eeee8f5a94b5b9908a4dba7d12f38a1b3fde9d40ce54649b2d9
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 11536 bytes
SHA-256: 235b0a38dee4ff5f42bccaf91cdc204531cf10ce8abf1be92d4dceec2d5f20ad
font_02_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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