Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd4450323283d5a…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 17:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d434c1fef4beb33722b2764c10d836c7 SHA-1: 03ac96f99f75af82da99050de2f4547e97375fb3 SHA-256: 1fd4450323283d5a9c84443fadce73800662f7d542d68ac22992908c7187a51f
164 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external PDF links. The document body, though heavily obfuscated, suggests a lure related to 'Ielts reading test example pdf'. The presence of external URIs, including one pointing to a potential phishing domain, indicates an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/award?keyword=ielts+reading+test+example+pdf PDF link annotation
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/sifejapamumod.pdfIn PDF document text
    • http://fimewot.xyz/zolalomewupovn6zs0.pdfIn PDF document text
    • http://evilcheats.fun/94179400344870pb.pdfIn PDF document text
    • http://trysoda.club/vopafqjkwr.pdfIn PDF document text
    • http://d-youtube.com/fiddler_on_the_roof_characters_audition_songs9t7vb.pdfIn PDF document text
    • http://ideaita.fun/xivadujazezuwijin9n14s.pdfIn PDF document text
    • https://lutaxabivuk.weebly.com/uploads/1/3/0/7/130740512/xipumewogovuf.pdfIn PDF document text
    • http://verification-help.business/pokemon_ultra_sun_and_moon_how_to_change_thundurus_formgj9dy.pdfIn PDF document text
    • http://livecopyrightverification.com/wujixuxemie7.pdfIn PDF document text
    • http://pro-konditer.com/batman_begins_filmyzilla5wo34.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://bu-markett.com/xexalinekoreb0woa.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/zubuwujoxom/72960576955.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/91719061677.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/android_bitmapfactory._decodefile_options.pdfIn PDF document text
    • http://ponusiniwanus.epizy.com/scarlett_18i8_manual.pdfIn PDF document text
    • http://pakekaririwofas.rf.gd/36781190195.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/49657540965.pdfIn PDF document text
    • http://tivozinugokitaw.epizy.com/appreciation_letter_for_internship.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/okcupid_full_premium_apk.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_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5368 bytes
SHA-256: f19b36a140dda86e04e17cd024a4c2c92e03cb70a084a82dd32579040b4a42ba
font_01_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 10948 bytes
SHA-256: 218c4af25c3a148390cb6affaa6a8a6b277527583e43312bd1ac2a19ba391a27

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