Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa66c35cf3a3158…

MALICIOUS

PDF

76.2 KB Created: 2021-03-08 20:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76cf71b3badf63458459d6af908ad88d SHA-1: 45bac133ea6d89adb0e3c5d419983e79b9ec59e0 SHA-256: 8aa66c35cf3a3158541ec0376ad8bc90073b28339498d6e7eeda09bd02809f17
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' containing 30 links. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious content or download further payloads.

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://baarspo.ru/123?utm_term=hazard+identification+report+and+action+form PDF link annotation
    • http://am-sound.ru/adobe_reader_para_android_apk_uptodownpvpne.pdfIn PDF document text
    • http://the-english-temple.com/garden_answers_magazine_free_seedsfxwoq.pdfIn PDF document text
    • http://qupieasy.online/93265699732zcdu2.pdfIn PDF document text
    • http://lunesygets.xyz/lego_star_wars_tfa_red_brick_codesd82jw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5fcb5a94cc3a8.pdfIn PDF document text
    • http://azorocheat6.xyz/406851896687t32c.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/gc0pgge/morris_home_furniture_huber_heights.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_6045bb36ba51f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462697/normal_5fcd508153fbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5ff22ab592916.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/gfQkHSz/85435764005.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/vinivuxo/66863852912.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_35c906960f5d4d3bbbcea87b307cf140.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/45511511453.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/vizio_d43-c1_remote_app.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/zubukamubetizogasizix.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/20030798769.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_8f9fafff6abc43ee8fce74b6f7921740.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/nizufolojozegomupaguzef.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/lezugorerodup.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/the_monkey_king_story_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/loctite_5510_technical_data_sheet.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_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 5104 bytes
SHA-256: 2377b734218de29eee2a3b51945986669943e3b133ff2ee13048251a26b89a7e
font_01_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10256 bytes
SHA-256: 921b566273c9ace3db6f9b6aaf063ac0058cdbf0d8dfd2bdcce62c8c96134281

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