Malicious PDF — malware analysis report

Static analysis result for SHA-256 399ff90647e74f01…

MALICIOUS

PDF

35.4 KB Created: 2020-05-15 13:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: d5cf88195e989585af7a94973ff7c0ac SHA-1: c7926ab745558656eb99a5cd7db790ef5fccc036 SHA-256: 399ff90647e74f011a5bd499fec6b64bdb7a205c06304def20014eae080a6dc8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document is designed to appear as job interview questions to lure victims. It contains a large number of embedded external links, forming a link farm, which is a common tactic for SEO poisoning or distributing malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://wehappyhair.com/uploads/1/3/0/8/130874391/130874391.html#job+interview+questions+answers+call+center PDF link annotation
    • http://poweltonconstruction.org/uploads/1/3/0/9/130969206/miwijevogerum_rukevamovo.pdfIn PDF document text
    • http://ududgans.services/uploads/1/3/0/3/130323454/xadelagakesovogiwo.pdfIn PDF document text
    • http://tvsfl.org/uploads/1/3/1/4/131411762/zelituzuruxezo.pdfIn PDF document text
    • http://norskskulpturbiennale.no/uploads/1/3/1/4/131438456/wuluvakifenon_revodivubusej_vidubitap.pdfIn PDF document text
    • http://greatlengthslawns.com/uploads/1/3/0/7/130775551/pakipama.pdfIn PDF document text
    • http://traversebaypainting.com/uploads/1/3/0/7/130776814/5879375.pdfIn PDF document text
    • http://matrix-eft.com/uploads/1/3/1/1/131164239/6d0a60c828d939.pdfIn PDF document text
    • http://faithfinancialpartners.net/uploads/1/3/0/7/130776041/a76aa4f7d.pdfIn PDF document text
    • http://rmgilmoreauthor.com/uploads/1/3/0/6/130621788/bexezaka.pdfIn PDF document text
    • http://dragonfly-organics.org/uploads/1/3/1/8/131857117/bopikuvewatelulinet.pdfIn PDF document text
    • http://builtonselfsuccess.org/uploads/1/3/1/0/131070378/5107819.pdfIn PDF document text
    • http://spectrumcrafts.net/uploads/1/3/0/5/130551090/nilefavixelajova.pdfIn PDF document text
    • http://northeastbathrooms.net/uploads/1/3/1/1/131164318/mawufira_vapifarodid_mataza.pdfIn PDF document text
    • http://neasoto.com/uploads/1/3/1/4/131407292/5207726.pdfIn PDF document text
    • http://dexterjones.co/uploads/1/3/0/2/130287896/nafima_nixuririzat_pobad_napik.pdfIn PDF document text
    • http://peterkennyonline.com/uploads/1/3/1/6/131606345/0e0d19e.pdfIn PDF document text
    • http://lonepeakwoodworkx.com/uploads/1/3/1/4/131438127/602069833653.pdfIn PDF document text
    • http://revrhondawillerer.com/uploads/1/3/0/9/130969539/fumafigirosupanokaw.pdfIn PDF document text
    • http://wheatgrassandchampagne.com/uploads/1/3/0/3/130323141/9462729.pdfIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC7 10080 bytes
SHA-256: 526536af514a2d8df66ef42e9cd74b0c638eee8641480e74bf5141263f1d679e

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