Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3823e831c717322…

MALICIOUS

PDF

77.5 KB Created: 2021-04-02 00:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0858b9c9ad7274c9e1a0503906fc5812 SHA-1: ad534fbf46ac433ff8e8ff4db69d71d39e379950 SHA-256: a3823e831c717322dd980b72f18db897b0d53c689a965dd5cc153e7f949c97c3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://gimoguvi.ru/123?utm_term=i+am+coming+home+song++pagalworld', is directly embedded and flagged as an external URI. ClamAV and an ML classifier also identified this PDF as malicious, likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/123?utm_term=i+am+coming+home+song++pagalworld PDF link annotation
    • http://firstflirts.site/1754734256879mdb.pdfIn PDF document text
    • http://memokepudag.iblogger.org/apparel_manufacturing_sewn_product_analysis_4th_edition.pdfIn PDF document text
    • http://techanomic.com/butterball_electric_turkey_fryer_instructionshua2g.pdfIn PDF document text
    • http://erogan24.website/akg_perception_220_microphone_reviewqkolg.pdfIn PDF document text
    • http://mujorofujezigi.iblogger.org/chronicles_of_narnia_movies_in_order.pdfIn PDF document text
    • http://paksorond.xyz/80109739306unhjb.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/fulazelof/mobiwuvojekusu.pdfIn PDF document text
    • http://refofigeto.epizy.com/what_are_the_basic_tenets_of_taoism.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/interior_design_styles_explained.pdfIn PDF document text
    • http://kuxoxulid.epizy.com/tamil_new_animal_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/57682733064.pdfIn PDF document text
    • http://rubujizuz.epizy.com/acymailing_newsletter_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fd2768-033d-4fe7-8efe-01715261adb6/why_is_my_fellowes_shredder_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/eclipse_che_free.pdfIn PDF document text
    • http://melukibojenubud.rf.gd/42774864839.pdfIn PDF document text
    • http://lemijafuw.epizy.com/one_piece_grand_battle_rush_apk.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_0d76eda7ba14457f800702dd1bfbb9b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9337d6c6-b70c-4e70-a87f-ead8476be1a3/bezulik.pdfIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_6144dbdec1d04afca19496487e80995c.pdf?index=trueIn PDF document text
    • http://novegiw.rf.gd/how_do_i_reset_my_bosch_washing_machine_4.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/sizemefedogebokunitu.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_cb3db5d967cb4680982754750a006ef3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5dc007c-041a-4960-a512-ea708fa3ab29/franny_and_zooey_symbols.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_5c5505a009fa4fe391626ed015a515ab.pdf?index=trueIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_2fcb1191636344eda32a7e8548dd00d8.pdf?index=trueIn 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_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 5516 bytes
SHA-256: cd5554980785185ad6f13d291c0960acf6c848c81adc06aa1af8a7b10503b7fa
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 11288 bytes
SHA-256: 002894895354fc36d6132c31bb0e55ceb63437f6a3a13690bf31e50aa856dece

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