Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b19308f6289d83…

MALICIOUS

PDF

90.9 KB Created: 2021-02-24 20:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7071e9beee4d9d7aca155be0936331d0 SHA-1: 85d89ae7c1d851da39a914fdaeaf7ce0f42ac02f SHA-256: 41b19308f6289d833b3a1f030938a436d051633cbee51b32f86dd4c466704476
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/award?keyword=what+is+the+main+idea+of+rumpelstiltskin PDF link annotation
    • http://babudategajuzul.iblogger.org/guidelines_esc_2017_valvular_heart_disease.pdfIn PDF document text
    • http://atomyimperial.ru/ariens_8526_parts_manual3hqwu.pdfIn PDF document text
    • https://ranilabat.weebly.com/uploads/1/3/5/9/135999147/5421501.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/jbYjajj/wivomemat.pdfIn PDF document text
    • https://gosabejeda.weebly.com/uploads/1/3/1/4/131453015/zeposuvopufewo.pdfIn PDF document text
    • https://xusopulude.weebly.com/uploads/1/3/1/0/131070786/5261951.pdfIn PDF document text
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/kogekutegoluzom.pdfIn PDF document text
    • https://vozunekoba.weebly.com/uploads/1/3/4/9/134902797/4032c9375.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/ahgxL7L/53520080685.pdfIn PDF document text
    • http://deduwewelu.iblogger.org/fishing_report_washington_lake_ms.pdfIn PDF document text
    • https://gigodetexopisi.weebly.com/uploads/1/3/4/6/134630538/d9398f.pdfIn PDF document text
    • https://kafomepavazepa.weebly.com/uploads/1/3/1/4/131409794/2760800.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/bufipevuril/email_writing_formal_and_informal.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 4956 bytes
SHA-256: 671d910417ae2e8ef33063f358edded0ac1b35cf50e3b49aa88876f4da3890ab
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 5360 bytes
SHA-256: bc5268205cc3a710ecbaf69996de8b49e0e3c4cec7a01ebbc5a63d8d4f4d0197
font_02_sfnt_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 14244 bytes
SHA-256: 325fb4a49ce474cf3b43814cbf696b521ac395b4d760634b064b26e1abe9449a
font_03_sfnt_off000144cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CB 16660 bytes
SHA-256: 6a69c88b32265fbd526838e6f5226176957f3c4c9917c46e3769405e599fcb6f

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