Malicious PDF — malware analysis report

Static analysis result for SHA-256 437a10b5042ca7ba…

MALICIOUS

PDF

71.2 KB Created: 2021-02-19 03:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 893d92906967990c5394f1095e472c0c SHA-1: 8038eee5bffc313ae174fe5d5ff87a391c6286f5 SHA-256: 437a10b5042ca7ba956c9b6babfeedfb88fded88f61a7f2b7e3af5e0bf3a3ac4
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially disguised as movie downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=night%20shift%202020%20full%20movie%20download PDF link annotation
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/vumegunozu_barilopapi_xigiriga.pdfIn PDF document text
    • https://rawesare.weebly.com/uploads/1/3/3/9/133997405/3394629.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/tapediture.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/07221ca5ed.pdfIn PDF document text
    • https://bavipakodotem.weebly.com/uploads/1/3/5/9/135958795/bujurapabovas.pdfIn PDF document text
    • https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/7e28b811014.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/suxugipipolazog/alt_balaji_free_apk.pdfIn PDF document text
    • http://sogisujomixugo.epizy.com/filezilla_server_setup_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/long_tailed_lizard_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/tixowasofovositaxupekijok.pdfIn PDF document text
    • http://mujixexebekipan.rf.gd/kazefo.pdfIn PDF document text
    • http://resipivoxopir.rf.gd/xizagisikuzitetodij.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/bokapolo.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/full_backup_android_phone_to_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/rowinizipezanisabarikinod.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/16171903703.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/high_speed_video_er_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/dewalt_dw718_chop_saw.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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 5620 bytes
SHA-256: adacd95cadc7c5282f02eb94549874920280d75bf4cf5f98a05132884e472f9a
font_01_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 10656 bytes
SHA-256: 25029770912424194e8d49fc12311e44d60ed2041113a0ed06326713ae2e7314

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