Malicious PDF — malware analysis report

Static analysis result for SHA-256 257d9222510f3074…

MALICIOUS

PDF

90.2 KB Created: 2021-05-11 09:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc5e5f39f4bb33aec92bd0c2797cc047 SHA-1: aedf4a004846d455434e2cd80b4348deb0c7998d SHA-256: 257d9222510f3074b98880cfa624960808c5400245b617bb38f8511c1edd3d9e
136 Risk Score

Malware Insights

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

The PDF contains a lure related to a popular mystery author, likely intended to entice users into opening it. The embedded URL and heuristic firings indicate that this PDF acts as a redirector to a phishing site, as evidenced by the 'free-download phishing' heuristic. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://zajinet.ru/strik?utm_term=agatha+christie+disappearance+solved PDF link annotation
    • http://viewcreditscore.info/strategic_brand_management_keller_5th_edition_free_downloadzulrw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476946/normal_600cfb9854696.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/extracellular_buffer_system.pdfIn PDF document text
    • http://xuritepizib.mygamesonline.org/19409471250.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/jimukibigogene.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/banking_and_finance_noun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_5ff7ccc75a90e.pdfIn PDF document text
    • http://gratoram.site/dragon_age_origins_blood_mage_guidenzdjx.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/bloodborne_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fd8dbac19604.pdfIn PDF document text
    • http://ginixotojaru.medianewsonline.com/character_of_lady_macbeth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resilasijajatil.myartsonline.com/wewineferu.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/seamless_bible_study_book.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_3658a017daae4e338a2dc821205d19c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/legeguxasivun.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_db67dd8d95f446299d9c2640336605d4.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_d9afbc8060fc4631870a05af2ef18de2.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_647b2f388860410eb70f8b55c6a138ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/weather_report_chennai_cricket_ground.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/59506042225.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/pefofej.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/diono_radian_car_seat_installation.pdfIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_83902cc6a9cd49d187250e1688918bca.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_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 5384 bytes
SHA-256: 57fb3f57fe48841b3bb7bb1ba61885b4af851a2c4c80256bf81892a21a09bac6
font_01_sfnt_off00013507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13507 11316 bytes
SHA-256: f5b666bba6681d2467cb47d5f0ccff3e2e5d6b7209818a0c1110ce1f4263c2dd