Malicious PDF — malware analysis report

Static analysis result for SHA-256 113bbbe87b075cdd…

MALICIOUS

PDF

72.8 KB Created: 2021-02-17 07:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fcd1f53fb6f5cac322547b3f39f5257b SHA-1: 4420b746825d3a7f4294bae6ca81e142798b6482 SHA-256: 113bbbe87b075cdda009ef8a0f7c8f6362eb05988ec2c1c101afdab318c7c5e2
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and potentially malicious hosting. Heuristics indicate a link farm designed to direct users to external content, with ClamAV identifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/wix?keyword=birds+by+joe+complaint PDF link annotation
    • https://cdn.sqhk.co/noluxokeruma/uiaihM0/ludo_classic_board_game_free_dice_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/jahuR5J/25233835715.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/jermcgj/14315855952.pdfIn PDF document text
    • http://openchambre.xyz/binding_of_isaac_item_unlock_guide0tdgi.pdfIn PDF document text
    • https://lirurarupo.weebly.com/uploads/1/3/4/7/134770738/sowejux-ginela-ruzujiri.pdfIn PDF document text
    • https://tupadutuxoti.weebly.com/uploads/1/3/5/9/135974222/genekizefeke-lonomukimatoxil-visowaxipewex.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/uQjhju4/tiles_images_floor.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/HRjfghG/89369091941.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/WGvhegh/dwts_2020_cast_pros.pdfIn PDF document text
    • https://xawawamofolapus.weebly.com/uploads/1/3/1/4/131436997/6937414.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/hd405Dt/switchblade_tattoo_flash.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/IieohhK/xawowaroved.pdfIn PDF document text
    • http://zakukat.iblogger.org/fable_the_lost_chapters_demon_doors_guide.pdfIn PDF document text
    • http://1xbets-regs.site/antique_cast_iron_skillet_identification_guidegw51q.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/jifedefujodu/animator_job_information.pdfIn PDF document text
    • http://molobexe.rf.gd/intelligence_test_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/order_apterygiformes_characteristics.pdfIn PDF document text
    • http://mezajunezu.rf.gd/coral_chorus_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_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 5584 bytes
SHA-256: de9e7a9c30f54b6434336f28612a329d62acdacdee15861f62346f8309dc4d36
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 10416 bytes
SHA-256: e530d72e3dee790c74665aa00d7e2fc2e08aca271c41056e2b54193979e52165

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