Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1853cb87a78376…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 11:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29e266abfd196cea07369f1ee606c1c1 SHA-1: d5c70f5dae9781f067e2198f321b746175fc4cf6 SHA-256: dc1853cb87a783760ad2c1c7e1ddfe7b64a27180e6325463b75b4cedf07f7d67
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. The embedded URLs suggest the PDF acts as a lure to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=federal+state+and+local+government+worksheets
    • http://workshop-fb.ru/kamifugutavitekonibajewe7nd2q.pdf
    • https://rikekipodoze.weebly.com/uploads/1/3/0/7/130776447/15a14019bc29c.pdf
    • http://bewujasixi.mywebcommunity.org/big_data_tutorial_free_download.pdf
    • http://digosige.mywebcommunity.org/jeronetebatadexakagejub.pdf
    • http://lianhua.life/vulagoxiduqc1lx.pdf
    • http://reawont.online/51179885797o4hys.pdf
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/c12915.pdf
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/zuviweguminajediwod.pdf
    • http://lowwsaw.xyz/todd_lammle_latest_ccna_book06gk1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_6562b84fa31542938b7d8cd0743757dc.pdf?index=true
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_36dbc133de39482fa3380f2ee565a4c8.pdf?index=true
    • http://wififeju.atwebpages.com/pamewosuxudonisunez.pdf
    • https://uploads.strikinglycdn.com/files/6987703a-0a0c-4447-a02d-45c1a64591f5/88274762427.pdf
    • http://viwuwijagabote.myartsonline.com/20962539664.pdf
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_438a86886d5b4eea943df07b013882af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4575ac9c-9917-4c23-a436-648335cf82a5/jejinipojanixugedozeruwa.pdf
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_9f3a1ce8fd364f33997b8f44a67fb46b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fe62ca19-595b-49e3-bf15-8887acb0ba4d/kotavudafuketo.pdf
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_e385b170fa9f4940b5ae3633294894a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0db674fd-1539-4ff2-a1c4-919e8b0bea21/adobe_premiere_pro_cs3_user_guide.pdf
    • http://bemabam.myartsonline.com/collections_in_java_with_examples.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d3.bin
185e1525eb462459ffe4a9308cd5fa19e45f11fbe1e2a47dd856a9ea3be0b97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 5524 bytes
font_01_sfnt_off00010685.bin
f511986c41c54cb811ae117aef76b0ed37e6c4974cc5978b22c39ef0b070cc96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 10508 bytes

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