Malicious PDF — malware analysis report

Static analysis result for SHA-256 66af4d53c3e8a8a8…

MALICIOUS

PDF

77.2 KB Created: 2021-04-04 19:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 534884ab2e12ba06d34d5c601da805bb SHA-1: 9cf1d5091353a758301994ac5efe5081e86342ee SHA-256: 66af4d53c3e8a8a85a2454f19d7ab677c401f2d95b43b28d3ca692d08a442bc1
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 0.9996

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://gimoguvi.ru/strik?utm_term=how+to+manage+surface+water PDF link annotation
    • https://cdn.sqhk.co/dapubebireba/dXjdy5q/tagstagram_the_best_hashtags_for_instagram_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/ja3jdii/origami_halloween_ghost.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/jbgjygv/lazewodime.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/aibjxic/rally_car_racing_meme.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/gewuwasi/tixotipamuvunobowomabuw.pdfIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_bace6f39f8bc440db6e80a7bad8d3620.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_66c69cfa22e94eca9e63c357d135d40a.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_18dcc8b30f5b4c6091b064cd22884966.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_28270e7f6a3c423b85ede8c460da6054.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/vaxenugi.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_12a32a90938e4e8b9ab75b9d5d54937b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/zotere.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/who_is_dorian_gray_character.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/dell_precision_m6500_graphics_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/46633694635.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_62868d985dcf4fdea2f0fabfac69069c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd186f9-95fc-4885-80c0-9b542881d99e/zujatajozutebabuji.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/brawl_stars_apk_android_oyun_club.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9579a46d-29bc-4fc1-8401-2658b17d79a9/how_to_install_ibooks_on_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e25dfc4-fedb-49d9-b914-26bed70b0ce6/what_is_the_hardest_boss_in_dark_souls_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/tawujugavig.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_73caf93a797144939d70ce65a610b56b.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_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 5224 bytes
SHA-256: fb32974dfcc850e3dc19e40c16116f927e54ec3b0ac3ca27a4f3239f94250238
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 11048 bytes
SHA-256: 0ac638945990a3cdbbc7996aa30f6b48b03fae8d4b74bddd76aaffb739504a87

Open this report in the interactive analyzer, or submit your own file for analysis.