Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a81b97535c65421…

MALICIOUS

PDF

71.6 KB Created: 2021-06-06 23:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 499d51e534193404b49cf2c51724cd43 SHA-1: 05df59bb356e87cd88e6378433783f122734ecc4 SHA-256: 9a81b97535c654214786d01751c48958173951b3d062b48e1925a9d24c590f31
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The primary URL, 'https://fokemale.ru/123?utm_term=army+punjabi+song+2019', suggests a lure related to song downloads. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=army+punjabi+song+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459914/normal_60080680206c2.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/50229.pdfIn PDF document text
    • https://bovefunovowuto.weebly.com/uploads/1/3/0/8/130873908/nurejimoxuk_marobadij_xelozuwigabiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_6052e21970f86.pdfIn PDF document text
    • https://lonoripub.weebly.com/uploads/1/3/5/3/135319728/bixuzufuvijel_wekumafad_baxujogobarim_bofuxafisujalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_6059bc6f29121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_601632e2b6411.pdfIn PDF document text
    • https://kaxudafesin.weebly.com/uploads/1/3/4/3/134355678/524a00cc9ad4c.pdfIn PDF document text
    • https://kofudisefases.weebly.com/uploads/1/3/4/0/134018526/pivokujasap-munemuwidut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455876/normal_6005dbb97f7e9.pdfIn PDF document text
    • https://tatidadimu.weebly.com/uploads/1/3/5/3/135383915/fudekefesimulegi.pdfIn PDF document text
    • https://majuzifulanapu.weebly.com/uploads/1/3/4/8/134887757/razonixigado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://depowota.pbworks.com/w/file/fetch/144676587/how_do_you_write_a_police_report.pdfIn PDF document text
    • http://mujusevo.pbworks.com/w/file/fetch/144481314/cinquenta_tons_de_cinza_filme_completo_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ca9add-6f07-49cb-8475-0a6874a541de/what_are_the_similarities_between_simple_and_compound_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d26c430-5ba5-4c6c-a511-3fe76c56b266/how_to_calculate_average_duration_of_a_bond_portfolio.pdfIn PDF document text
    • http://nixefijevumu.pbworks.com/w/file/fetch/144685392/boxing_star_cheats_2019_no_verification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f3746f-3ba2-4fca-9c27-acec05a34098/present_continuous_tense_worksheet_grade_7.pdfIn PDF document text
    • http://lipadune.pbworks.com/f/lou_gehrig_speech_full_text.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/6195762595.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/tlcharger_dictionnaire_franais_anglais_gratuit_pour_android.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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 5896 bytes
SHA-256: e9f403ff0acdb8d5a819ff0e026c358cd3f10fc16bd9e4c8995716a34bad9810
font_01_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 10596 bytes
SHA-256: 58000952bfba812bd763365279b9054930dac6b86e72ca0ba823a4756c8b22a0