Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c925e61777a713…

MALICIOUS

PDF

92.0 KB Created: 2021-05-18 15:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c8b0105a517b0efc9f9e2e8071eca715 SHA-1: 51139a9ceede31d7b791a1694185998e4d00a155 SHA-256: a6c925e61777a7130ede40786ee9213b53206896bf3b3cea6dd472bd0b43e7b8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://vilenefex.ru/strik?utm_term=harry+potter+and+the+order+of+phoenix+book PDF link annotation
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/biruretibap-potejuneli-tefinuv.pdfIn PDF document text
    • http://xivotadulivopom.22web.org/zukufulu.pdfIn PDF document text
    • https://wuxivebumuvarog.weebly.com/uploads/1/3/1/0/131070366/69999261e70.pdfIn PDF document text
    • http://vuwomodema.22web.org/bewevewavetonakunezavureg.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/magor.pdfIn PDF document text
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/8529083.pdfIn PDF document text
    • http://megenubi.22web.org/jujodalokasem.pdfIn PDF document text
    • http://xisulekotitis.iblogger.org/bible_app_free_for_mobile.pdfIn PDF document text
    • http://xudiremomikuxe.iblogger.org/77033331441.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/kovozenamofox/weekly_work_schedule_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/dexeze.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/vowels_worksheets_for_class_1.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/zuwivubuxuwofexonine.pdfIn PDF document text
    • http://surifuj.rf.gd/niwus.pdfIn PDF document text
    • http://samarusoreris.epizy.com/how_to_use_the_multimeter_digital.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/80577214848.pdfIn PDF document text
    • http://sakolizel.rf.gd/common_synonyms_and_antonyms_list_for_competitive_exams.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/niriva.pdfIn PDF document text
    • http://rodiwelivetekuf.epizy.com/albumina_del_huevo.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/ted_chiang_liking_what_you_see_short_story.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/interleaved_sheets_buy_online.pdfIn PDF document text
    • http://jogukazulani.epizy.com/48970920689.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/real_chess_3d_free_apk.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_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 5044 bytes
SHA-256: 1345afd7b210e41c1d9231a799e2d4241909ec264ff6f751ddd0e1a700b3b0ac
font_01_sfnt_off00012dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFF 11296 bytes
SHA-256: dbf0af40f7835fc5f1b2f3c51d29ea14f967aced06f893f492e8e8f54db397de
font_02_sfnt_off00015469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15469 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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