Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd4b116393989f3…

MALICIOUS

PDF

81.3 KB Created: 2021-04-08 02:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6115c55bc49e3cc806484ba442da95d0 SHA-1: 738619be4cbb299fdd42e765612ce0ed14f2d51c SHA-256: fbd4b116393989f3d9c7986b5bf892cedf5f1236182007e9834891d8b95b5cca
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'pressure washer hose repair', likely to trick users into clicking malicious links.

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
  • 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://soxebez.ru/strik?utm_term=how+to+repair+pressure+washer+hose+hole PDF link annotation
    • https://bokonipazesokut.weebly.com/uploads/1/3/1/3/131398478/luduki_fipaguxo_limaxokemo_geluxelalig.pdfIn PDF document text
    • https://dowoxadi.weebly.com/uploads/1/3/1/3/131380004/busedovomam-vovopifofor-mizujusulub-gurimu.pdfIn PDF document text
    • https://farenutatovepo.weebly.com/uploads/1/3/4/5/134502273/togenudig.pdfIn PDF document text
    • http://juilopkiretlo.ru/gufug8a637.pdfIn PDF document text
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/80cbea993.pdfIn PDF document text
    • http://show-visitor.xyz/what_was_martin_luther_king_jr_last_speech39zbr.pdfIn PDF document text
    • http://tameeniraq.com/72741591184twqrx.pdfIn PDF document text
    • http://help-ruleviolation.com/lofokaxigaw5pzar.pdfIn PDF document text
    • http://disupiwalu.mypressonline.com/bewesenovidigirule.pdfIn PDF document text
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/mudifusopa-riwatefiko-kodizumerixe.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/873339648.pdfIn PDF document text
    • https://gijesilikisuzid.weebly.com/uploads/1/3/2/6/132683000/3911433.pdfIn PDF document text
    • http://topcreditcheck.info/derecho_romano_en_ingles7xgu3.pdfIn PDF document text
    • http://50offshop.pro/spectrobes_beyond_the_portals_cardsx72ud.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/469fe.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/20759543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/nikumozoputubosobodapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d018b906-7ccb-4169-8bbc-d1b495665d5e/77725995106.pdfIn PDF document text
    • http://pulitisagot.atwebpages.com/75368682011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2adac970-ab43-4dcd-aa4a-075eb272baa2/delta_sigma_theta_intake_process.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_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 4960 bytes
SHA-256: f850261c2d2cf096dde04a6bfccfb8e78fe099d161087826080a00a7a5327319
font_01_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 11068 bytes
SHA-256: 27a2c5131592d675cbb7f3ec0a52002a793235ba444800b5e4579be6154e9d21

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