Malicious PDF — malware analysis report

Static analysis result for SHA-256 148684bb03757edf…

MALICIOUS

PDF

77.0 KB Created: 2021-04-06 15:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c6ff325f2a66671270b2d90a26a128f9 SHA-1: eb4a864c6440ef730f252a131d4c1783ce80e5a3 SHA-256: 148684bb03757edfb801d994a3f971d5fd6b8025051667fe01e37ea6f95304a5
224 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including links to known malicious redirectors and algorithmically generated URLs. The ML classifier also strongly indicated maliciousness. The embedded URLs, such as 'https://crophysi.ru/award?keyword=carlill+v+carbolic+smoke+ball+judgment+pdf' and 'http://privateguardingserviceagainstdanger.site/57650677559k3k3l.pdf', are indicative of phishing or malware distribution attempts. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=carlill+v+carbolic+smoke+ball+judgment+pdf In PDF document text
    • http://trackengine.host/25811978541apiox.pdfIn PDF document text
    • http://7evenrp.ru/994158631430w9es.pdfIn PDF document text
    • http://intereriia.com/vodiwuvigisid8cxyn.pdfIn PDF document text
    • http://amsidisi.xyz/sentences_and_fragments_worksheets4nks.pdfIn PDF document text
    • http://newberginvestmentproperty.com/bayesian_analysis_with_python_download6p7tj.pdfIn PDF document text
    • http://generatorsale.ru/xogavawv4rj1.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/57650677559k3k3l.pdfIn PDF document text
    • http://pedalini.club/la_suma_de_los_diasuf02u.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/bihar_tet_result_2020_download.pdfIn PDF document text
    • http://hotgirls.host/goxokunitetugevepeze7inel.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/feborobegibew/samsung_smart_tv_32_inch_series_4_price_in_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4dd988-9c1a-45f3-85e9-d2e5f86b7034/jerade.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/jemizosun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5965d8d-2d88-4c1f-a033-83b7f90e6820/bose_acoustimass_10_series_ii_review.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/gezovavizanejuvokaxosa.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_ad861f2630e94b088b01dbfea5fb034a.pdf?index=trueIn 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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 5720 bytes
SHA-256: 79fc88c22e79531baee2d2feeadc0bbd14782ea7f912a2e6db1207ba8205533c
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 12184 bytes
SHA-256: 96e34cf87b9b380feadef584ef1f00e1e986f1afcf90ff1e11178d20dafe4d9d

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