Malicious PDF — malware analysis report

Static analysis result for SHA-256 108913363b83e680…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 06:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d617507395e655cfaef7afee8a32670f SHA-1: 12bcb1f1378534759b4b542d88b9427eb09df02c SHA-256: 108913363b83e6800196f1dbc3493571c1bb2c3e9d9a73003e50f6152a0e9eb6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or phishing lure, aiming 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 URLs suggest an attempt to exploit users by masquerading as legitimate content to drive traffic to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=campbell+biology+chapter+16+reading+guide+answers
    • http://keksik24.ru/60147081268llc1x.pdf
    • http://avlto.best/cannot_uninstall_architect3fagp.pdf
    • http://persequen.com/rilofujadebozumuza0v199.pdf
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/gelifabomav_dogomit_jiwinowagebelej_vavaniforowujin.pdf
    • http://paxezimusosesa.scienceontheweb.net/junavuvezafupodobotomiluk.pdf
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/xelakonuru.pdf
    • https://povuwifapijolak.weebly.com/uploads/1/3/4/2/134265363/08fab2e1f0.pdf
    • http://khanapoorti.com/14666149640ynyws.pdf
    • http://tezibif.mygamesonline.org/49752750100.pdf
    • https://juzowesefuzifi.weebly.com/uploads/1/3/0/7/130775985/bemibojirerolaj-vawibisibibova-boninax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7c5c0cdc-4fce-44b4-94ae-6f281ff9c81f/nikon_coolpix_s4000_battery_wont_charge.pdf
    • https://uploads.strikinglycdn.com/files/15db0ebe-d1d6-478e-9daa-fd99cb639e5f/movumuxirifowanififapava.pdf
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_4b0e86901d5b4b59b9407ea9dca53080.pdf?index=true
    • http://vumovofun.onlinewebshop.net/analogue_multimeter.pdf
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_25549b8c6a0f45edb02b39f23e345875.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f99672c7-50ff-4413-8de8-7eec33ed9010/5167461049.pdf
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_f6667fa6e19040a1903e4b5f5fd8d12f.pdf?index=true
    • 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_off0000de52.bin
7ae29324e9d1040e5a8053d985ec0b0fb5ba7ea6bb3c3d2a87735cdbf01f8c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 5932 bytes
font_01_sfnt_off0000f272.bin
ca5f03b95fe5a3d500c976ec84d932351da867b8d3e1cbd3bd6815e4c12d7a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10652 bytes
font_02_sfnt_off000116db.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 4324 bytes

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