Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7779b617594e97e…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 08:23:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b7d6a0be3ed9a940c7e67d764edf6596 SHA-1: 05fc7fb4937bc86ea4bf2d845f87f11e10d83715 SHA-256: b7779b617594e97eef7d6ff1e1913a8d7ad011e2355b586e0b9e47d9d0cb2023
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/123?utm_term=4+pics+1+word+level+226+answer+3+letters PDF link annotation
    • https://zuwizogagotajal.weebly.com/uploads/1/3/4/0/134012426/8762295.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/kodezivamixadijaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471691/normal_5ff6d5af8ec45.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/BIje9jh/how_to_get_pax_vapor_app_on_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/g5cginR/15590644024.pdfIn PDF document text
    • https://cdn.sqhk.co/jokalirubore/hjXgf7e/danevi.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/pgiqZii/juzifefu.pdfIn PDF document text
    • https://sikupawabur.weebly.com/uploads/1/3/4/6/134624396/piwonot.pdfIn PDF document text
    • https://cdn.sqhk.co/fokodusi/M9zii91/the_galaxy_survivor_mod_apk_2020.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/penebijevizak.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/jcjh7HS/59571094959.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/Djejilw/guponadiwenunopivori.pdfIn PDF document text
    • https://cdn.sqhk.co/gotulurowav/ijPrgjw/37338940898.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/jhKihha/siruze.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/jjidggg/22073280822.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipomazuwasa.epizy.com/rowazorozuje.pdfIn PDF document text
    • http://welolazudadiv.epizy.com/formal_letter_to_invite_judges.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/87087659086.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/12110706928.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/google_login_button_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/jewabujamejolalonuwa.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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 5712 bytes
SHA-256: fb72afbdfce18783c4c92f2288c6a8310ee2b101af08ac636cc811ec81e7a5f9
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 11252 bytes
SHA-256: 5b08837bf57b8166936c5cee5a0bbe93023880fc865cc015d4357c989708ff5d

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