Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab88eb0a35ffad7…

MALICIOUS

PDF

67.3 KB Created: 2021-04-04 02:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51d23ddb71c5d714896bb91bcd7e5d9b SHA-1: 621c379fd797d0c566334e234d59d31dc4731bb8 SHA-256: 6ab88eb0a35ffad75101a2969d41d1ff9230e55ceb382981273fc60c26e73e45
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, with the primary malicious URL being https://bologen.ru/wix?keyword=common+core+long+division+with+remainders. ClamAV also detected the file as Pdf.Phishing.Trojan. The ML classifier output of 0.999610 further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=common+core+long+division+with+remainders
    • http://lopabobogegise.iblogger.org/self_reliant_examples_sentences.pdf
    • http://wajujofapukalim.22web.org/how_much_is_a_2013_chevy_volt_worth.pdf
    • https://cdn.sqhk.co/bodovukig/BHhghjb/lara_croft_relic_run_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/gepabafi/jhifCjc/basketball_skills_training_program.pdf
    • http://mscredit.info/plant_adaptations_worksheet_2nd_gradeyoqe0.pdf
    • https://cdn.sqhk.co/logubaxe/gR4hdhc/78000549294.pdf
    • https://cdn.sqhk.co/xamizine/cB2hbSj/block_strike_pc_dowload.pdf
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/3666206.pdf
    • https://xamelanaf.weebly.com/uploads/1/3/5/3/135331914/7622249.pdf
    • https://lafazomutege.weebly.com/uploads/1/3/0/7/130740298/d40890d2a03b9f.pdf
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/86a09df901b.pdf
    • http://tosety.xyz/abbyy_transformer_2.0naxc3.pdf
    • http://artyom.guru/100_number_chart43xa1.pdf
    • http://smilex.club/1053982194kbk18.pdf
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/faxuputowajupali.pdf
    • http://fatadakar.iblogger.org/tevetuwasirawiduzag.pdf
    • http://silvanozito.online/los_pronombres_personales_worksheet_answers1oi9q.pdf
    • http://ostanni.fun/kogama_parkour_wood_crazy_gamesb0gyh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/waxegatulo/cyber_bullying_articles_philippines.pdf
    • https://s3.amazonaws.com/wibedubosateg/iridite_8p_technical_data_sheet.pdf
    • https://s3.amazonaws.com/makumapikeze/digitech_rp50_manual_espaol.pdf
    • https://s3.amazonaws.com/dukavunivifa/curriculum_vitae_sample_for_undergraduate_students.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca68.bin
71ecb9874d08c7808f202dec50171a452bacb234985a5cfca42646216bb2f729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 5412 bytes
font_01_sfnt_off0000dcaf.bin
a0a60f0477dcdc4d3bc2a67657dfd91d18e719b59602d20cea75b6fbe43f71cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 10212 bytes

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