Malicious PDF — malware analysis report

Static analysis result for SHA-256 735e759cdc67799b…

MALICIOUS

PDF

81.8 KB Created: 2021-04-22 14:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 94a6b272138bda96bea8c68d5497a45c SHA-1: 25380c7d9766ddeaa15b7d8bd0735f12ab9fa6e3 SHA-256: 735e759cdc67799b59713d8f9beab60bc7b5d27180f476b19ba324ee55487d55
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://botokaw.ru/strik?utm_term=how+to+connect+my+vizio+sound+bar', is likely the primary lure. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/strik?utm_term=how+to+connect+my+vizio+sound+bar PDF link annotation
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/detulutupuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_606d66847d8f4.pdfIn PDF document text
    • https://puwawegolawibot.weebly.com/uploads/1/3/2/6/132682739/8120929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_602f188c44a11.pdfIn PDF document text
    • https://lesitoziperitij.weebly.com/uploads/1/3/4/3/134381346/e8c6dd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5ff3298de7f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_6054c1b68de79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_6031e9a810f92.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/didedixosolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_d2dc61227fe1413ea8a5f8c80b6f8c40.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_705527089fb74ca6bf1fe948abd82ac5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/putugonomebavenileg.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/esc_dyslipidemia_guidelines_2018_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/janmoni_assamese_video_song_free.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_9ac0d1c1200a4b49ae494690d7d6dc61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/rogelebasug.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/verbs_worksheets_for_grade_1_and_2.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_e6243965cece4e89bd8aa1acfefa9b7c.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_904244297bc9472f93ddd7710cccdca2.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_883a25bebe4b4a96b068f2197521b4e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/sample_email_requesting_information_about_a_product.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_b087096c906a42c9af981f083598672c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liluvad/ableton_8_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/3279467957.pdfIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_e7f2e8eb61c54939a42af87709bd89c8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 5340 bytes
SHA-256: 391cef0a38e1070c329e0151384a88649f23f7f12dab3ee6064cf17b2c287600
font_01_sfnt_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 10304 bytes
SHA-256: 8056e3c0f7149023b43dfc530b1c2fd2d779d73fb87a69f1689aee57c08d921b
font_02_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230