Malicious PDF — malware analysis report

Static analysis result for SHA-256 557699f9d446e4cf…

MALICIOUS

PDF

79.6 KB Created: 2021-04-09 06:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 33c4f1ed2229081001ccbd900cb75c50 SHA-1: 0a74abbdf61febcee53df694c6e88ee12cfa815f SHA-256: 557699f9d446e4cf4e780dbaad9dc673a41bbcdcb5f7c05a05c802609626e81a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or scam attempt. It contains a mass of external links, with the primary one being 'https://druttle.ru/strik?utm_term=how+to+use+convection+oven+to+bake+bread', disguised under a seemingly innocuous topic. The presence of numerous links suggests a link farm or redirection mechanism designed to lead users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=how+to+use+convection+oven+to+bake+bread PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412909/normal_60484f78e9226.pdfIn PDF document text
    • https://cdn.sqhk.co/gejikofoxaf/ieggTJZ/tiktok_invisible_filter_removal.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/aGRghNs/tiktok_creator_fund_views.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/QThjiaL/my_business_course_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/igNgihb/lapudem.pdfIn PDF document text
    • https://cdn.sqhk.co/lajazufuzu/xBhchaY/pusher_mania_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_604b1da4dd651.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/cjegjgg/10015721251.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/Djeb9gj/69740116382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470832/normal_5fd7d634bed8b.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/uifjfge/79012585995.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/jegeMjf/how_to_write_a_business_proposal_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/3JUx3jg/zopojozirewitozavujatapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d61fd71-70dc-4afd-8097-7ea10b7dc1b1/lexus_es300h_reviews_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122c0895-e18e-4f89-a738-3a20cb9db494/63382125912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7419754-b289-4e43-a6d7-b41693957a30/79106877456.pdfIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_74ea691b42e44f1dac0d5da9d137daba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0c100c-622c-4e1b-97e0-ead20b13937e/how_to_connect_apex_digital_converter_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69838e32-7d78-4169-921d-3f86eeb5221a/35304270439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6faf96be-6d0b-4e83-abdc-96888cb6e9cb/how_to_use_maschine_with_fl_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ac1001-fdb0-48ab-9cb6-ca8856ad097b/32703290437.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_b18b0c088059407483b75ec0c5f6226c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/264df77d-47b7-4175-b603-a97559e84fef/who_created_cheese_curds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44388139-4574-49f8-8867-50b5b30b9e93/why_cant_i_find_my_airprint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4692fd0b-0941-4272-9b4b-2881d9162154/11332196257.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_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 5216 bytes
SHA-256: 53dcfe10d24ef1501ba4d82634f0bf25eaec0f6db69dc02a41491455783b070e
font_01_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 11248 bytes
SHA-256: b49ed01b8baa38537ba4a0e5c9c2c2a727014b0f2904c35db6a6501118e443de