Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a23f4d4ea89ec9…

MALICIOUS

PDF

75.8 KB Created: 2021-01-26 11:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 531f30480c2920606c58ab60469c7bee SHA-1: 747bc968a1b5d69866325731ecf62e4cb0dbf369 SHA-256: a0a23f4d4ea89ec9ea5cdbcced782ce3b2c062bbd284b7378753d607f24979f2
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The heuristic firings indicate the document is designed as a link farm on disposable hosting, likely to phish users or distribute malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffmen.ru/123?utm_term=southern+high+school+baltimore In PDF document text
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/luzidomokijim-sukuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fe036cc7e909.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5ffdffeee7544.pdfIn PDF document text
    • https://didefitelov.weebly.com/uploads/1/3/0/8/130874246/vufozog_xefavedu_nuxuwos_zutiraj.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/iiWl5Nm/zuvod.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/fetifule.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/hh9k5hd/85672415634.pdfIn PDF document text
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/8cde8b80df5.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/Yjfgige/65205236579.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/gf7Bpjj/snakeskin_retro_11_pink.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487663/normal_5ffaabeb7e9b0.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/fhfr6Ia/tewozuvidiwujadazug.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
    • https://s3.amazonaws.com/tulosa/63748094376.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/11313237128.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/present_simple_exercises_elementary_level.pdfIn PDF document text
    • http://bibobega.epizy.com/bawowexozinumimowisepi.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/rilosinubezate.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_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 5340 bytes
SHA-256: 976450946cc9f6c22364010d397628dda9f738dc7f31876ec880eb769b9fde6f
font_01_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 10640 bytes
SHA-256: 1a81a1be5926b923c0e9ca68180a3e387731c4caf776a03f377109756b686546
font_02_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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