Malicious PDF — malware analysis report

Static analysis result for SHA-256 163b3e4e75d04580…

MALICIOUS

PDF

78.5 KB Created: 2021-05-27 18:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f0d4a729a81a17f7d03631aa24ebb196 SHA-1: d18185f58a98e75316df8710f91950b72802805e SHA-256: 163b3e4e75d04580afbf27c41ca986af7563eb94d63102bde0016d15161805f0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

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
  • 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/strik?utm_term=can+you+customize+the+kitchen+island+acnh PDF link annotation
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/f11d76533477.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/zuluvire_bufijiz_rizunivuv_nuwidorido.pdfIn PDF document text
    • https://solujasamaro.weebly.com/uploads/1/3/4/6/134695729/famavamutoti.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/notakofifuwipariv.pdfIn PDF document text
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/7c3b32ea.pdfIn PDF document text
    • https://xexibufit.weebly.com/uploads/1/3/0/7/130739933/10632d9f77f94.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/908865.pdfIn PDF document text
    • https://tagaxaxe.weebly.com/uploads/1/3/5/3/135390661/7280126.pdfIn PDF document text
    • https://girowefado.weebly.com/uploads/1/3/5/3/135349553/a70032c4cbb674.pdfIn PDF document text
    • https://dutumujupag.weebly.com/uploads/1/3/1/3/131383630/kojeferoneko.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/mopir.pdfIn PDF document text
    • https://zaloposigino.weebly.com/uploads/1/3/0/7/130739621/8a5727.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1311d29-fed8-4bee-ab82-5d538a0998c9/months_of_the_year_lesson_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d73a4e-f1f1-4d56-aac8-53a6806ddac8/03_dodge_durango_oil_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2395ba-8992-458c-bbc9-7cc715ff0a98/what_historical_event_caused_the_second_agricultural_revolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8500c7e-0a4e-48d1-9560-3d8bc8869053/54271773029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ec6fd2-4bd1-4bb4-9872-f0b2ba15adc1/35348686020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e402a628-4c44-428a-8e50-6ab456470106/in_aschs_original_study_what_situational_factors_affect_conformity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b49e163-0460-4fad-82d0-47a5f290283e/nato_alphabet_mancy.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_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5204 bytes
SHA-256: a97f2a7711eb0d8a8ea30799f10ec82f4777cda59e92f44e66297464a34667c4
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 11848 bytes
SHA-256: 94b8116504788da32b64cf6136787e86ca9825faa1fe87a78aac9dca2b27561b