Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bf62b75db67262…

MALICIOUS

PDF

81.5 KB Created: 2021-02-20 00:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 780b61f891225a00ba797f3aadecb401 SHA-1: 086506dee72e290942894f29f7d8107a4ffe1672 SHA-256: f6bf62b75db67262816ac056eb662495cbb56b47ac7f74ac8c16371e670a23d8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains or link farms, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, further suggesting the primary purpose is to host links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/strik?utm_term=line+6+spider+iv+15+tone+settings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464523/normal_5ff2b2244c63e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496193/normal_5ffbd87b3f95e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463543/normal_5fdf505535bb2.pdfIn PDF document text
    • http://makeyourself.xyz/16180812681fsbc.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/fhigjDV/43719675148.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/DjgViik/45933491777.pdfIn PDF document text
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/tiwelawokokelawadar.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/wjhC8ic/xibuwetuvesid.pdfIn PDF document text
    • http://compte-cmbretagne.best/10205797509al699.pdfIn PDF document text
    • http://medicalpracticementor.com/488573266536fyoy.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/fd8f51e3e.pdfIn PDF document text
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/6331264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369509/normal_5feb754fd85d0.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/b5gficW/pugife.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/lGjgNB9/paradise_island_show_season_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fe7b26f7cc5e.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/bhfHiej/the_solar_system_to_scale.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/RjhT1ht/73623159239.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/nolepoginonipexexof.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ed8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED8F 13544 bytes
SHA-256: 38873b26a3e4e81aae31a924ae838738207afa973f206b15c14137a1e2ad493b
font_00_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 5216 bytes
SHA-256: f722aa46732c8577043830099059f6d656f64fbb1a43512a57f41096b9d9e0b2
font_02_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 10928 bytes
SHA-256: 0e79f08ed9257e63546645ace5963fbba90f9c2789e2931f538bf538f709f57d

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