Malicious PDF — malware analysis report

Static analysis result for SHA-256 376b032ad75047f1…

MALICIOUS

PDF

76.8 KB Created: 2021-02-23 23:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3c4bfba94323187820cb67f8bd761e68 SHA-1: c0d3fed9c00b12cfc64749b475877ab1af02b6e0 SHA-256: 376b032ad75047f105c51a2968c5ecb49cbb469c493ce1c3e1a55dc15faf25a3
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to manipulate search engine results or lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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.
  • 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.
  • 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/wix?keyword=vlc+tugger+gains In PDF document text
    • https://cdn.sqhk.co/wugeguxu/JQBMjhx/59046320869.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/Whfhaja/29376118117.pdfIn PDF document text
    • http://dorututulawes.iblogger.org/90448022620.pdfIn PDF document text
    • http://getcabinets.xyz/how_to_set_up_ultimate_ears_boom_32imh2.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/vadokugodozumu.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/e9d34560d5e4d6.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/guievFp/xezideravisivale.pdfIn PDF document text
    • https://cdn.sqhk.co/fanoxozowupe/RFdSzib/68052736303.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/ableton_free_for_maczfjif.pdfIn PDF document text
    • http://fixebojamofi.iblogger.org/kilamiposaw.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/9158338.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/sljhFgf/56353021411.pdfIn PDF document text
    • https://fovezifume.weebly.com/uploads/1/3/0/8/130874198/6311845.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/g0jiRgw/stickers_de_among_us_2020._9._9.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/hNhaMyo/18928583909.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
    • http://lemujiv.epizy.com/bashment_12_by_dj_bash.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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 4704 bytes
SHA-256: 58a8f0975d51977ccf3406670fb11954009731ca65a5ed46ce421719682160e7
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10420 bytes
SHA-256: daedde677105d1fa1b1b703d170a75197143205c8ac4476354ed33404146b72f
font_02_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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