Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6c21eff43243c5…

MALICIOUS

PDF

74.5 KB Created: 2021-04-03 22:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ec56801b301ca0f6444d6fed7b253d2f SHA-1: b2a790550574c5ab09b219d2cecb12c170446b4c SHA-256: 3d6c21eff43243c52c67ac8d01a63a63b295a5c355b5343ffdb6af5b9f99152a
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 0.9997

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://bologen.ru/wix?keyword=rotating+shapes+90+degrees+worksheet PDF link annotation
    • http://wosedumuf.mywebcommunity.org/64960244012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471099/normal_5fc773545f3cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5fe422525323f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_6033113d56dcf.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/16052007924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501660/normal_603592ef31245.pdfIn PDF document text
    • http://affilateapp.online/bodatepiteruvevcomr.pdfIn PDF document text
    • http://timurberg.ru/how_to_uninstall_sandisk_secure_access5ytz8.pdfIn PDF document text
    • http://geesecam.com/how_to_cook_brisket_in_a_roaster_oven4r0mq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_605f4b1229ac3.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/tuwelopokivonadodiwavu.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/nizuvix3ed5r.pdfIn PDF document text
    • https://natapoja.weebly.com/uploads/1/3/0/8/130813782/kagawa.pdfIn PDF document text
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/cb3ac52922b6a4a.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/lomogas/new_amplified_bible_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/who_is_the_ugliest_boy_in_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/affidavit_sample_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/4052218499.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/94712988526.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/guided_tour_auschwitz_from_warsaw.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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 5648 bytes
SHA-256: 8b3b66f1d85e60ca5d0841b9b89802eefb637d5c776a936cf569518b722fbde0
font_01_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 10904 bytes
SHA-256: 83b0423584d24975a9466a7add748134626f9921600f816b83dda8f69342491f

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