Malicious PDF — malware analysis report

Static analysis result for SHA-256 4401de06ad18ae8b…

MALICIOUS

PDF

86.3 KB Created: 2021-03-23 21:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f7fff6f55336dd4f09ccc823d2de8063 SHA-1: 90234b58bd69598b9b51c36eb49e3b92c6e7c332 SHA-256: 4401de06ad18ae8bfa3733e44d5bc9e89901c636c4f64d9278943e1f22a10f7c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/123?utm_term=marriage+anniversary+song+with+name PDF link annotation
    • http://mp4.design/327790467213ntza.pdfIn PDF document text
    • http://shopbest.online/black_and_decker_automatic_feed_spool_replacementshmnr.pdfIn PDF document text
    • http://dazenad.iblogger.org/rifazelamivabexoviralenoj.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/pdf_genetics_and_evolution.pdfIn PDF document text
    • http://jotisetafifuni.iblogger.org/86030188349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_60195778714c8.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/dell_inspiron_n5010_laptop_original_battery_price_in_india.pdfIn PDF document text
    • http://gepavozo.mygamesonline.org/meiosis_worksheet_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_601ef295cdc23.pdfIn PDF document text
    • http://stroiline74.ru/3009006653509q4x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_5feda6c70433b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449630/normal_60260e1a8c014.pdfIn PDF document text
    • http://submonster.xyz/bigixedenumorejinaj0ypvl.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/juxosabevegowabefira.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/a_level_biology_question_papers.pdfIn PDF document text
    • http://topdouche.xyz/58805613413ytj1z.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/95000833747.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/tirimofufemukat/android_activity_transition_animation_bottom_to_top.pdfIn PDF document text
    • http://jowunimigafej.rf.gd/irctc_train_seat_reservation_information.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/55467313633.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/4k_background_pics.pdfIn PDF document text
    • http://wetetepipemo.rf.gd/92358991394.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_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 5324 bytes
SHA-256: 271ff1eb3c1efa59658ce254116390e7c14b83b921ef596220f4eb0b536d4dac
font_01_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 10996 bytes
SHA-256: b76e7239ada7b4ada0d69d2830fc44d81ac332c6a4e36f6e54ac36105faeb0b2

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