Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2056a8d598a92ab…

MALICIOUS

PDF

76.5 KB Created: 2021-04-26 12:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 90ec943c33803d626b66450bc4c37bd3 SHA-1: 710b164a3b9bbac510f684a4d0117eca8376132d SHA-256: f2056a8d598a92ab5ce1a998247865d7ca69cd5c1a1dfc31c2440ef537686435
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://seumenha.ru/strik?utm_term=is+the+ged+science+test+hard PDF link annotation
    • https://cdn.sqhk.co/kumotuxijufu/js8VgcQ/ruguwele.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/9208291.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/gegej.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/wirositobire-fojed.pdfIn PDF document text
    • https://cdn.sqhk.co/pumapajewa/dnhhRZt/31585314172.pdfIn PDF document text
    • https://cdn.sqhk.co/zepigelona/dgeifij/ff8_remastered_dragon_fang.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/bipepezuwed/capitalization_chicago_manual_of_style.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/boiler_output_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/coca_cola_donations_request.pdfIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_282f2070d5274558adab6b89b57f048b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/523cc0a9-9aa5-420e-8202-aa6fbd243e77/14202644452.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_30d272e7b2294ed585fdc88bb5a5815c.pdf?index=trueIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_34ae53cf63e344a98a9932eaf95146a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dec5d0b-f4ba-42a8-ba7d-f1f4da194c07/which_book_is_the_witcher_1_based_on.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/mental_math_exercises_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf69988-4aa5-468f-93a9-00801874d627/makexeduge.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_f8bfcacf472047268d469288e26b6678.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3f03d5-beb2-4ff5-9072-c248437bd757/how_to_use_lg_ac_remote_in_mobile.pdfIn PDF document text
    • http://mafokesa.onlinewebshop.net/accident_incident_report_form.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/selegidojexew.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/wezuxiwij.pdfIn PDF document text
    • http://vegubom.atwebpages.com/kegolesiximo.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 5104 bytes
SHA-256: 472191a1dc7920e25da67cc03e12b54b5597ad3642e9d8f910fccc3befdab622
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 10500 bytes
SHA-256: 27744fa0bf72858baae37144ff6463c4fdcdcffd44040feb3400d679994822fa

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