Malicious PDF — malware analysis report

Static analysis result for SHA-256 273cc392553ebd4b…

MALICIOUS

PDF

83.6 KB Created: 2021-04-08 07:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e43194aebe9dad79e522ded31b9968d8 SHA-1: 211ea091d6c91118c28d7ce677569b8eac33f80a SHA-256: 273cc392553ebd4b841bea38bb8c7d3ef093d8ee8e9785872770c8de7c69eb8c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/strik?utm_term=fluke+5615+probe PDF link annotation
    • https://cdn.sqhk.co/sugutomipu/jghEian/togesalekufapa.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/jfhgttz/90631383067.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/jdPLgim/pencilmation_new_videos_2019.pdfIn PDF document text
    • http://rudexikuritisi.iblogger.org/word_formation_exercises_with_answer_key.pdfIn PDF document text
    • https://tafedelimege.weebly.com/uploads/1/3/5/3/135345870/togudofu_putodofumaxiv_foruditajej.pdfIn PDF document text
    • https://jekaboda.weebly.com/uploads/1/3/5/3/135398795/f74092b4ad8e26e.pdfIn PDF document text
    • https://fakozopaximubod.weebly.com/uploads/1/3/1/4/131453484/8331854.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/PjfyjiB/does_working_out_make_your_voice_deeper.pdfIn PDF document text
    • https://vajizekof.weebly.com/uploads/1/3/4/5/134594154/zuduminewime.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/lugolutaliwapafazij.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/f65c009bf09da.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/nazekisigiduz/gujigamekunizifawesiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/42333695716.pdfIn PDF document text
    • http://rajokawaxes.rf.gd/vugatimasikis.pdfIn PDF document text
    • http://mumufikoxid.epizy.com/jaxesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b32a605-c3f0-400f-9171-3ceff26e9a4c/how_to_get_your_driving_record_md.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57802c5-0b78-41c3-8949-f7ca7fd846f3/jefiwimotexujuzojomu.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/diaphragm_seal_pressure_gauge_datasheet.pdfIn PDF document text
    • http://mavoweba.epizy.com/35462019191.pdfIn PDF document text
    • http://sobavetugobi.epizy.com/15442027192.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 4916 bytes
SHA-256: ec1adb4b1033b2066dc30e7c79cd0343096f58eb8ce21ed8e27559c6ea9fe177
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 11880 bytes
SHA-256: 808a1db03312594915a5c5e7a9fc03a0b0e26a4377d6a796d137ae506ac9dee6
font_02_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 16260 bytes
SHA-256: d25a34a56be33791b66bd7dbe91ee772b39b89bee75ba0e64ef3ea6cb2c10b57

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