Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6adaf333807d189…

MALICIOUS

PDF

72.1 KB Created: 2021-04-03 18:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ca967de34d36b419ae3aeba9873e1766 SHA-1: 78d909723a37f20a33b64eac7975c9a67460b6e2 SHA-256: a6adaf333807d189a1b0494113fe9cff571e40df6f515acb4635288bf08ef24a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI and a redirector link pointing to 'jacksth.ru' suggests a phishing or malware distribution lure, disguised as a strategy guide. No scripts were extracted, but the PDF structure and external links are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/wix?keyword=knights+of+the+old+republic+prima%2527s+official+strategy+guide+pdf PDF link annotation
    • http://rovanenafet.getenjoyment.net/1017202734.pdfIn PDF document text
    • http://tedusoxunola.22web.org/what_to_do_with_cards_against_humanity_expansion_packs.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/nogofutowu-waruve-zawipodaxojikod.pdfIn PDF document text
    • https://lodotimafigu.weebly.com/uploads/1/3/5/9/135981467/491beb066.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/oxford_picture_dictionary_french.pdfIn PDF document text
    • https://nezododirexu.weebly.com/uploads/1/3/0/8/130813510/678466.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/jesukasegukuneno.pdfIn PDF document text
    • http://zufunepel.iblogger.org/cheapest_android_auto_car_stereo.pdfIn PDF document text
    • https://japugaze.weebly.com/uploads/1/3/5/2/135295186/3ff279207.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/dosalapasenow/hush_hush_sweet_charlotte_cast.pdfIn PDF document text
    • http://godubaxedija.rf.gd/83686306590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/addb204d-2a6d-428c-9205-3edf8c9625f0/85568263662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a02537-e9ac-43fb-8f33-cfd3d9fb83f8/taxewulerizikowaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca6b382-a8c2-49e2-87d8-acaf39b6d257/sifugomixifogoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/increment_request_letter_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64389583-bd5e-4bb6-9b65-5580bdf5e6dc/megam.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/gdpr_compliant_consent_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/vimolimel.pdfIn PDF document text
    • http://ruxazek.epizy.com/nujokomoxeretarudexeje.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/microsoft_machine_learning_algorithm_cheat_sheet.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/solid_converter_to_word_free_download.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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 5816 bytes
SHA-256: 0fa048afb46bfd9ef9fb086757c6b3fe82481441e06d57cf8d9f141dc2a6a522
font_01_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 11680 bytes
SHA-256: 6e5505906db07b31a4692c92b3869baae735af5af98fde1561e7c439050e72a9

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