Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1025b1e312b32bd…

MALICIOUS

PDF

84.7 KB Created: 2021-04-28 09:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b74509945f0b1f1d9c59ebcedfa3f721 SHA-1: 562dcc337bd8591adc8976aaf21c1967e826e4c7 SHA-256: d1025b1e312b32bd06db87078e1a4ca879526496daef78dc4e214d00ba0f6335
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or SEO manipulation tactic. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm its malicious nature, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure point towards a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://pelibifir.ru/strik?utm_term=coachmen+rv+used+prices PDF link annotation
    • https://mewuvonemifutu.weebly.com/uploads/1/3/5/3/135394867/wosadoxawojifilal.pdfIn PDF document text
    • http://trendmobile.ru/tamasha_full_movie_hd_worldfree4umzqbn.pdfIn PDF document text
    • http://nikomodemudajo.iblogger.org/classification_of_cerebral_palsy.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/5eb70.pdfIn PDF document text
    • https://wofugegiperezaj.weebly.com/uploads/1/3/4/5/134528457/6714356.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/satub.pdfIn PDF document text
    • https://potezevaledu.weebly.com/uploads/1/3/1/4/131406960/5570956.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/descriptive_paragraph_definition.pdfIn PDF document text
    • http://gewusoluxul.scienceontheweb.net/advanced_excel_interview_questions_and_answers_free_download.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/kanefomivezume_masopesafud.pdfIn PDF document text
    • http://idealica-italiaofficial.site/80069638325maidj.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/ordering_numbers_1_100_worksheets.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/p90x_workout_videos_free.pdfIn PDF document text
    • http://neuroncraft.online/14761342071kjpl8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://forojiwimudobo.atwebpages.com/burn_degree_classification.pdfIn PDF document text
    • http://xirasajizobopa.rf.gd/vujuvilesizekukonitekut.pdfIn PDF document text
    • http://tunowik.epizy.com/rirovebibigopavu.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/medical_insects_and_arachnids.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/tijozojurewexesa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 5164 bytes
SHA-256: 337c0e2500d73be289571bb5ef16a3f45b5ec7fb8a8730202388d61faf90944e
font_01_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 10892 bytes
SHA-256: c57d4cc38f049990b00f38b61fac42665eaef010ae002c7b9dd76910d25cae5b
font_02_sfnt_off0001374b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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