Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc147e7bbf95c205…

MALICIOUS

PDF

79.7 KB Created: 2021-02-20 17:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 481d5efe9e0db43dff98d6c78f863ae7 SHA-1: 5f33795a3a4b9609b1d185201c67abfd2913e057 SHA-256: bc147e7bbf95c20573d728dd961651c4aea8a07e36ef12c48fd6f02cd5dfe742
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF's structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

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
  • 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://jottigo.ru/123?utm_term=solving+quadratic+equations+by+factoring+worksheet PDF link annotation
    • http://rocketdocs.us/2008_dodge_caliber_warning_lights_and_what_they_meanb72tf.pdfIn PDF document text
    • http://ruwegekugite.22web.org/jogiwewefusozakej.pdfIn PDF document text
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/woriji.pdfIn PDF document text
    • http://freshnatur.fun/fizafaxisukugebuvesjbxos.pdfIn PDF document text
    • http://zodazaze.22web.org/brooks_guide_rails_2._0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_602bed5317408.pdfIn PDF document text
    • http://zefunafujazi.22web.org/instagram_blue_tick_sticker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465145/normal_6003bd9ebbcbb.pdfIn PDF document text
    • http://creditscoretracking.info/always_hungry_david_ludwig_downloadykzyf.pdfIn PDF document text
    • http://viwimewi.22web.org/45187447145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5ff0ec3676acd.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/lebafi-gabanalep-powarotaxivu.pdfIn PDF document text
    • http://cupe1.ru/xutavefipagojuzavore5ka1g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_60303a9d6fde0.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/tolosazug_zukipeg.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/fomudebipefasu/56743224161.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/architectural_working_drawing_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/oh_baby_tamil_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/3994755460.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/zifesedinalijigesefusif.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_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 5968 bytes
SHA-256: 60022b69daba569ac587b7e38f027b0fd9cfa293e77674e58a95e9d6a6d212b8
font_01_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 11016 bytes
SHA-256: 502926554ee40610910d6e1e8a8f1dbcdd74549cb21c3d883922aad89f61616a

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