Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab20eff575d617b…

MALICIOUS

PDF

76.9 KB Created: 2021-01-04 03:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9d8fa9a515a268aaeeb9e0d2c31c5bfc SHA-1: 615854d2fbf7f1c0b403553da190598d82e42fef SHA-256: 0ab20eff575d617b00d814df8c12d12990b2946420ba99c71238751ceb3e5541
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://ggtraff.ru/123?utm_term=flash+notification+apkpure In PDF document text
    • https://cdn.sqhk.co/gefimiwotux/gfgijYO/12069526751.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/jacjbn5/12162193570.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/ndjaYoy/61581592619.pdfIn PDF document text
    • https://gifuliranofave.weebly.com/uploads/1/3/0/8/130873810/berozog.pdfIn PDF document text
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/9081509.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/jcMsDig/95087793593.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/hgeheR2/xemibusibalobegawawagagur.pdfIn PDF document text
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/faradaxa-kivipabap-vexez.pdfIn PDF document text
    • https://bexatumabe.weebly.com/uploads/1/3/4/8/134852132/140151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_5fd6459c79790.pdfIn PDF document text
    • https://gofobodobade.weebly.com/uploads/1/3/4/4/134444694/kinezapubasukosiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488582/normal_5fe2639ba2243.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/hfgjicC/cnc_3d_design_free_download.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/6211f7b2850.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://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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 5004 bytes
SHA-256: 1f8dc94962dd3a3eb90af21f00988ceb18667a7d1bfbf077c3430567bdea149f
font_01_sfnt_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 1936 bytes
SHA-256: b896cf420d67f16b10940560c9bed40f752809473624917c27c77593c290bb83
font_02_sfnt_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 10376 bytes
SHA-256: af7fed7701a47b7e5cb7bf7db0d75917b7faf38804594c5ddad434b5226a395d
font_03_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b
font_04_sfnt_off0001169b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c