Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef607b69a68c216c…

MALICIOUS

PDF

68.5 KB Created: 2020-12-17 00:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dfe888305d3ebc1c9c963a22ff0b58cf SHA-1: e461a506e23ef8e6d55fd26246e74cb35a0421a2 SHA-256: ef607b69a68c216cb4252c592faceba3ee58de362d309081c40b0264feb698d6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. The document body, though partially garbled, suggests a lure related to 'Hubspot email marketing certification exam answers' to direct users to a suspicious URL. The presence of numerous external links, some of which are benign but others lead to potentially malicious domains, indicates a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffe.ru/aws?utm_term=hubspot+email+marketing+certification+exam+answers PDF link annotation
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/531e87.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/dazovosugev/burton_custom_flying_v_size_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc316c9a5bc066edfb3e2e2/t/5fcb5f1026a2be7f6de30ec5/1607163665348/gun_shot_fire_war_game_download_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/allah_k_99_names_audio.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a69f81da8a590db1d885/t/5fd68d6b034a586a4f4abb13/1607896427862/91068489625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b266784e-cf8b-4d23-b2a6-b5590f401b43/45278345565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69eaa4e-901c-49f9-8bc1-203e9d322060/gozepizotuforasosoposure.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/80845837590.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bf1b9955c744b53ac36d/t/5fc0e7a12dd96f5918106c6c/1606477730667/nordictrack_act_elliptical_23896.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4cb348ef7301f8b29e6b1/t/5fcbe53664036b61439b3901/1607198007280/56560813796.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf54d13f75b16643cc0a24/1606374611851/king_of_thorns.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79f8343c5ee75bf2d4911/t/5fd6cd6113a48350e822f671/1607912815986/zinumixakobiwenet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c24392c50b1a1e76d225/t/5fc584493c02f22b9dc8d3d1/1606779980283/zugerubujuvajakebesatemo.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/70155560944.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_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 5660 bytes
SHA-256: 83f2841c3d6db32f74e841051f5d4e61b1104945aa2353489cb3223f7151fbfc
font_01_sfnt_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 10724 bytes
SHA-256: 90dc001c572d3a0eea80e07aa180fce0fa03af6887477f64941c9d0258574aca

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