Malicious PDF — malware analysis report

Static analysis result for SHA-256 185c2d3496ee8d09…

MALICIOUS

PDF

81.5 KB Created: 2021-03-10 01:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94f9f55fcb56d1f892ecab50d3025f93 SHA-1: e1ad7d3242eac3d3b173048250a1a9df3b966e57 SHA-256: 185c2d3496ee8d09a6c0ad2e17a34c6f2734b6e9c7015daf41a37de70850bf8c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, a technique often used in phishing campaigns to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/aws?utm_term=walt+whitman+high+school+alumni+huntington+station
    • https://static.s123-cdn-static.com/uploads/4381081/normal_5ffff1efc6682.pdf
    • https://cdn.sqhk.co/sepokafaru/ijhsEhd/vofixewavalo.pdf
    • https://cdn.sqhk.co/gobenebovi/jihijhi/39785127685.pdf
    • http://pefiworawodud.mypressonline.com/gmat_book_2020.pdf
    • http://gejejasofubi.mywebcommunity.org/neumonia_neonatal_aeped.pdf
    • https://cdn.sqhk.co/karapenakozi/4ibhdJH/marketing_manager_jobs_houston.pdf
    • https://static.s123-cdn-static.com/uploads/4480423/normal_5fcb52507c629.pdf
    • https://cdn.sqhk.co/xajamenujo/zjfijic/45546501445.pdf
    • https://cdn.sqhk.co/demejapad/ie0DU77/financial_times_lse_login.pdf
    • https://cdn.sqhk.co/somisafeg/jjv29HY/photogrid_video_pic_collage_maker_photo_editor.pdf
    • https://cdn.sqhk.co/fobonelaga/vja9NaD/children_s_double_bed_linen.pdf
    • https://cdn.sqhk.co/gadujotev/ajeCFjb/wabixafuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dejazuvorira/algebra_2_online_textbook_answers.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_d9f5996719de4b9aa2f676ee8669bf31.pdf?index=true
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_80c06a363a5244699a05f2dc5e989d72.pdf?index=true
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_7c3bc3c59b384e15b3fe72f6572f03e2.pdf?index=true
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_99177f50025840dc8cd60fbe4fb7c424.pdf?index=true
    • https://s3.amazonaws.com/suxugipipolazog/zumarobovegutiwu.pdf
    • http://tapoloferazuziw.atwebpages.com/how_to_trade_on_metatrader_4_android.pdf
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_73c2c6c322554c4abf87aa514341e5b0.pdf?index=true
    • https://s3.amazonaws.com/tidigudetefumof/foxubedowe.pdf
    • https://s3.amazonaws.com/fobupojowojon/weekly_scheduling_calendar_template_2019.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/feromuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02f.bin
904e9b1264f8c1c86ffce301b89c9bba2f40ae3329d03545bb092cd302ccad25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 5108 bytes
font_01_sfnt_off000101de.bin
2e06a44ea9c4f7002e668aa35042be3664c583ab36db4c0a91a8af0cb577c2c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 5224 bytes
font_02_sfnt_off0001139c.bin
b8549c0a497742a3afdd2ebbc223bec7d08f3075e63f5563bd6edeef85c3ee44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 10528 bytes

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