Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23b444e41489aed…

MALICIOUS

PDF

77.5 KB Created: 2021-02-05 14:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5992223db0556854b741691ee97b1ef3 SHA-1: ddf1a30af1dd10e040e3d4cb36f4368143d7779e SHA-256: b23b444e41489aed5f60352ef4c3f47def02fc8c45e1792d765e0f7438e17316
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting an attempt to manipulate search engine results or distribute content broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/wb?keyword=tassazione%20apprendistato%20alta%20formazione PDF link annotation
    • http://giocodigital.fun/xaregupesanezvoym.pdfIn PDF document text
    • http://damvglaz1.xyz/73234466210smt91.pdfIn PDF document text
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/wetupawovalutosi.pdfIn PDF document text
    • http://lonedowubolile.iblogger.org/45946294726.pdfIn PDF document text
    • http://navewezaninub.iblogger.org/lalki_chunariya_odh_ke_song.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/sXihmic/truth_or_dare_netflix_movie_trailer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nagev/agribusiness_management_barnard.pdfIn PDF document text
    • http://sowujakuje.rf.gd/gta_san_andreas_android_aptoide.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/background_music_for_slideshow_free.pdfIn PDF document text
    • http://sewekovekejir.epizy.com/b._ed_exam_form_2019_uok.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/jeniram.pdfIn PDF document text
    • http://duzujijola.epizy.com/importance_of_refractive_index_of_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/nevilaxuxijup.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/dukefewamat.pdfIn PDF document text
    • http://dobejul.epizy.com/jaratejazokakivegutat.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/burley_wood_stove_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 4972 bytes
SHA-256: fdce6d2f84b18f04772ca2b42e643742b81d21041a79ca90182c97f2ab3eb3c4
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 10996 bytes
SHA-256: a22ea0be946a4ed9aea2d75a551954a9b081f55ada225f4c676973f4f944c05f
font_02_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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