Malicious PDF — malware analysis report

Static analysis result for SHA-256 756237fdca08ae5c…

MALICIOUS

PDF

73.8 KB Created: 2021-01-23 15:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4dbda695371a33fc7f62d84faa5db163 SHA-1: 902867a656fda058d70a2e56122c4767a9152d6f SHA-256: 756237fdca08ae5c452b27e3e5a70b7209716115d84ff5e9a9fefd66151038f5
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to external PDF documents hosted on disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The presence of a known malicious redirector URL and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffmen.ru/123?utm_term=antologia+de+poemas+introduccion In PDF document text
    • https://xesevurodat.weebly.com/uploads/1/3/0/9/130968943/644603.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/jmchenm/zefewedoza.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/fOjAhbV/65947361434.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/bsYjd9t/love_live_wallpaper_for_pc_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455197/normal_5fcbc3116bcc8.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/2572858.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/e8cf58b.pdfIn PDF document text
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/mudux.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/Smgdqxh/how_to_fill_cube_vape_pen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_5ff7bb231d3cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485309/normal_5ffbd693ce026.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/mGLg8jh/clean_virus_iphone_x.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/dilwvmX/40038497926.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/linikesopikoto-fimuj-zirunebivi.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/vifik.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/dawusuvobaxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_60039b88270af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanesipub.rf.gd/22277030482.pdfIn PDF document text
    • http://tuwofexuguxu.epizy.com/68225662921.pdfIn PDF document text
    • http://debukigezi.epizy.com/barbie_doll_coloring_pages.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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 5380 bytes
SHA-256: 96a558aeb7f6b6065811573b11cc1d902345360e0aabaf01437302309432e8c1
font_01_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 11296 bytes
SHA-256: b2069b060324dc29c00d08274cf43a4e6627e9cb5e7644c058af4b360991edaf

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