Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc77626edbb12fd3…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 21:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb3c3f17015f2eee2502b7cc76def483 SHA-1: 7df701a3f80b33b85963c5d3db027d2d306bb8c6 SHA-256: fc77626edbb12fd31c320f2d2a30e39378b8b77badba8dc76a55ee218bf7b1f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing attempt, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme, likely leveraging embedded JavaScript for execution.

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://leonvi.ru/award?keyword=holum+fundamentals+of+general+organic+and+biological+chemistry+pdf
    • http://reduslim-shop.website/72256687825dxn6v.pdf
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/f66995052753b.pdf
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/tiduruxerekoduwoxane.pdf
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/da2ef3dd.pdf
    • http://vashobereg.com/fundamentals_of_management_9th_edition_griffinncg0c.pdf
    • https://gijosugomigul.weebly.com/uploads/1/3/4/3/134317853/vidinevijipotof.pdf
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/e5e465c.pdf
    • http://tenakororor.iblogger.org/lagu_bobby_darin_dream_lover.pdf
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/3066875.pdf
    • https://jivetigaforivuj.weebly.com/uploads/1/3/4/3/134350389/8907449.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_ea1df604e2c7420ca8009bb2fcc150c7.pdf?index=true
    • http://sexorokizuziwes.epizy.com/texas_tax_rate_by_zip_code.pdf
    • https://s3.amazonaws.com/nowokil/depodabesavuxosa.pdf
    • https://s3.amazonaws.com/kotodur/barbie_games_pc.pdf
    • http://fegifujeviba.epizy.com/animorphs_book.pdf
    • https://s3.amazonaws.com/lanorolowu/animated_smileys_android.pdf
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_910322db05c84f93aff5e7b0a069baff.pdf?index=true
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_7f8616c4c8954432a934ef666f4094be.pdf?index=true
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_83b8ac7058d847838b76c7e30d18d343.pdf?index=true
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_1c3848c35e854ce685eb72aef41d9903.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcb.bin
67dc89dfaa2d7373ca28b7c47335f87e78d0e50f0219c0d22de56c37ba268340		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 5772 bytes
font_01_sfnt_off0001034c.bin
dabce211392cbb641516fe88dae492a65284d23e5128e33e59e3c6acb95da706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10728 bytes

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