Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b63d98d8ab3d86a…

MALICIOUS

PDF

126.3 KB Created: 2021-02-03 01:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 44f803746250e0c43c2d1c2f94f5c289 SHA-1: d0416db129489846a5e6e84415dfd3e0f1adda59 SHA-256: 3b63d98d8ab3d86a2b787de4e6c712e31e5888046fdd78a027b1879c4fb39fbc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/aws?utm_term=aaple+sarkar+maratha+caste+certificate+form PDF link annotation
    • https://cdn.sqhk.co/wezopexa/hae7Tih/ikea_bed_sheets_australia.pdfIn PDF document text
    • http://natalifu.22web.org/charmsukh_behrupiya_episode.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/IA9rHia/empire_hexing_ciu.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/hc0jhbB/91875304427.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/igiagdo/imdb_bollywood_suspense_movies_list.pdfIn PDF document text
    • http://nowofuguvinidaw.iblogger.org/48477530060.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/9709474.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://fedorahosted.org/lohitIn PDF document text
    • http://wubexemetaxoru.epizy.com/the_casino_job_full_movie_hd.pdfIn PDF document text
    • http://bisubop.epizy.com/acls_guidelines_for_antiplatelet_and_fibrinolytic_therapy.pdfIn PDF document text
    • http://buxamojajowolos.rf.gd/tonawaxikabi.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/dinner_s_ready_word_ladder_answers.pdfIn PDF document text
    • http://gamumilow.rf.gd/teguxasizolib.pdfIn PDF document text
    • http://jolivawojo.rf.gd/zunamuvakozekug.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/mathematician_worksheet_answers.pdfIn PDF document text
    • http://kuzibawo.rf.gd/acrobat_pro_free_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/loaded_questions_game_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/muwewonakamili.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D85 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off00017808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17808 4988 bytes
SHA-256: 865dbfd9207f624b0433f5778ef92a25f95bb5f116eeac9522530a1f77039571
font_02_sfnt_off000188fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188FA 11404 bytes
SHA-256: 3c7a544eafc60bee32bd0e26cf98b5d7640fbf6a6fd3b51f6452653265e9e1ed
font_03_sfnt_off0001afe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFE5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
font_04_sfnt_off0001bde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDE6 15084 bytes
SHA-256: 91e045d443d7abf467c004f73a956c680b41fb56f1ed7f7a23fbb032fc90b3b9

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