Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53de98948b48e20…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 09:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7e5b217889a4ae94f108057403d60177 SHA-1: 3b92c9dcf82869dc8d0152ffe0676897755b16a0 SHA-256: a53de98948b48e20d07ee84760f8637761d5f59ffe62cbb0cb72f437687f0759
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a PDF SEO link farm. It contains numerous external links, including suspicious ones like 'https://vilenefex.ru/strik?utm_term=history+of+modern+art+pdf+download' and 'http://sijubuwejipamun.mywebcommunity.org/stage_1_early_rheumatoid_arthritis_in_hands_treatment.pdf', suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to distribute further payloads or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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=history+of+modern+art+pdf+download PDF link annotation
    • http://sijubuwejipamun.mywebcommunity.org/stage_1_early_rheumatoid_arthritis_in_hands_treatment.pdfIn PDF document text
    • http://adv-workshop.site/14640172636s58ha.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/41448588160.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/fajagibekowete_barafopukuw_nixaguzod_vosusalinukula.pdfIn PDF document text
    • https://kimukotepasa.weebly.com/uploads/1/3/5/3/135329918/lokupovefagale.pdfIn PDF document text
    • https://fukopimuwevi.weebly.com/uploads/1/3/5/3/135351499/623097.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/tsduck_user_guiderxgx4.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/vukusa/bonivazi.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/14349133032.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/bob_stroller_car_seat_adapter_chicco.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/arjun_reddy_telugu_movie_bgm_ringtones.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/92416958560.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/twitter_old_version_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/bootstrap_4_form_inline_button.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/40303167031.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/transformers_revenge_of_the_fallen_bludgeon.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/open_4k_video_er.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/b_d_o_full_form_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/antivirus_kaspersky_trial_free_version.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/low_back_strain_stretches.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/muleziwuximolobepegolerif.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_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 5344 bytes
SHA-256: 8ae506102605db287f8029db83af0464a5212aa1ad5856d00c06ed3eaa32cf35
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 10956 bytes
SHA-256: 72274ae6a6f90caa4b2c53f488fbb18061205b7e4782eb949a6903b29a6460c8

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