Malicious PDF — malware analysis report

Static analysis result for SHA-256 3617856ac4dbc501…

MALICIOUS

PDF

138.8 KB Created: 2021-03-24 03:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cebbbe8f9b484f81499cdfde577329e0 SHA-1: dc06267f74b0f2146ea69e9fe2dd31befab0fe81 SHA-256: 3617856ac4dbc501b941eb71b37cf7c8ff760e938b7723dc7ff4c9ec5c17aae0
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors, indicating a link farm designed to lead users to harmful content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to product reviews, suggesting a lure to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=arctic+king+12000+btu+window+air+conditioner+reviews In PDF document text
    • https://cdn.sqhk.co/zebenane/jcYc8po/92933901618.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/diidigW/panzer_platoon_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/hhIqhjP/plants_vs_zombies_android_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/zihhhje/play_my_movie_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/Dj267jh/69669635148.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/tejasomoleto_zukor.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/hdig9jc/gmail_logo_change_date.pdfIn PDF document text
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/musugujurix-gijepozilot.pdfIn PDF document text
    • https://javabudonoban.weebly.com/uploads/1/3/2/6/132683403/lazarejezanezew-baxenu-gafanu.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/igjcVFv/89931587648.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/pinezixiresetulovitu.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/uB0gfeH/57641313875.pdfIn PDF document text
    • http://nutapobo.iblogger.org/how_to_setup_logitech_harmony_650_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/zgijghe/24476870840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotuwelu.rf.gd/20300045030.pdfIn PDF document text
    • http://kinapemib.rf.gd/39230789977.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_ac959bcd41424c47b17f2068cf0cb868.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_aa13545d830547a38968bf2aa1a3871c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFB6 3372 bytes
SHA-256: fba1d17f4c4a30e4da75ed211a6afe1883ff6ea96f63eeee371cf44358726886
font_01_sfnt_off0001dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBC5 5744 bytes
SHA-256: 64c0b886fa64f1ff88434a13aff6d953f9244dbc10984817e7dd1d2489159c20
font_02_sfnt_off0001ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF83 15456 bytes
SHA-256: a5a94c50365e9e054da58a379606de09ef005dfac25c039fd1f77e0df2075cd7