Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ccb8917775dcb9d…

MALICIOUS

PDF

69.6 KB Created: 2021-03-18 18:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f200a71f3af97c08b103c84d2c623104 SHA-1: b071ad1539165cf28142e4511ed8f025aa7ecd34 SHA-256: 0ccb8917775dcb9d1524466790ef08be2e99781b758f91367d50fd87ccdeeae2
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm, indicating a phishing or spamming attempt. The primary malicious URL, https://xezojetit.ru/strik?utm_term=how+to+recognize+a+zener+diode, is identified as a redirector, likely leading to a phishing page. ClamAV detection and ML classification further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/strik?utm_term=how+to+recognize+a+zener+diode PDF link annotation
    • http://tuvawom.iblogger.org/what_is_the_role_of_effective_communication_in_health_and_social_care.pdfIn PDF document text
    • http://xigotev.iblogger.org/administrative_tools_win_10.pdfIn PDF document text
    • http://espaceabonnes.com/lotus_notes_domino_interview_questions_and_answersaxvzh.pdfIn PDF document text
    • http://ruzazeruduzelu.22web.org/crucial_conversations_book_summary.pdfIn PDF document text
    • http://sibuvre.com/mojezoxoseguroxelif8a50.pdfIn PDF document text
    • http://copyrightsupport-ig.com/91308298683azejv.pdfIn PDF document text
    • http://natur-bio.space/angular_change_templateurl_in_controllerjdz90.pdfIn PDF document text
    • http://canonsburglake.com/jomufokiduwubazetetunuliqwihs.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/fobupojowojon/42425802835.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_9aa40f75ca5443fb88723cefaaf5993a.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_3cf76e2d2c0f4048ba45e5f582802ace.pdf?index=trueIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_a69d7e79405742e1be22510c89fe0680.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/89384826207.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/android_tv_apps_not_updating.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/bbc_iplayer_radio_failed_abroad.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/what_was_the_north_atlantic_treaty_organization_nato.pdfIn PDF document text
    • https://6b2d4799-12fc-456d-8881-596234ac9a0a.filesusr.com/ugd/ae8ff6_ff3dbc6c7adb459e85f58a45b807b333.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_28b9eac44f6a46289e3e94e09f8b8398.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/nccn_guidelines_hepatocellular_carcinoma_2018.pdfIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_901b343f4fe84bb2bbab82a0b3e541ba.pdf?index=trueIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_36f483a41a3044e39495d84b2a92849e.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_360c4e5b52584baaaedecee11ccd0e7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/dipebiligazugogununumuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/m_e_logical_framework_template.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_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 5000 bytes
SHA-256: f8cedc762d143fbeeb4fe543f6651b87a4cf7a848e3403b6e6bfcaf48c9bbe62
font_01_sfnt_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 10776 bytes
SHA-256: 17b89cfc922a7f5a61536b1cde6ced93806968761f85f29c0b1b5ae84cf8bbfc

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