Malicious PDF — malware analysis report

Static analysis result for SHA-256 107800ad7880d3d7…

MALICIOUS

PDF

82.9 KB Created: 2021-02-20 14:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5f193fcbc46fdda25d6dc8af8bb20d9 SHA-1: 71bfbef8506ddddb848ed7b0b0b2e710b7f76bb0 SHA-256: 107800ad7880d3d718ad7a080280ce8ac63c5fe41ebacf7dd7842633ad14b9d3
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable domains and are associated with link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=how+to+reset+hp+p1606dn+printer PDF link annotation
    • http://rm-swis-mine.com/john_deere_mower_deck_adjustment_knobgfflv.pdfIn PDF document text
    • https://vowevabejera.weebly.com/uploads/1/3/0/7/130775986/losam.pdfIn PDF document text
    • http://yesstore.pro/wexaliwineliretijajimwpu2v.pdfIn PDF document text
    • https://nawodovifuvobix.weebly.com/uploads/1/3/0/9/130969758/ridelofosi.pdfIn PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/64006e84.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/26783317813azb2t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5ff116adc77bc.pdfIn PDF document text
    • http://getsol.xyz/microelectronic_circuit_design_5th_edition_jaegeri0hsx.pdfIn PDF document text
    • http://smallita.space/896886482m1146.pdfIn PDF document text
    • http://tudiweva.22web.org/california_zip_codes.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
    • https://s3.amazonaws.com/desenaz/free_ancient_civilizations_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/ringtones_for_android_2018_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 4992 bytes
SHA-256: e846209c8e283c390bf9c4e31775cfd7c423f6f1e4b1f6bd2c471822318ed60d
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 10856 bytes
SHA-256: aba05c255e810cbfe457bc9d7b2dc1bf414ced7439101a8cc1fbbfeaf40cbcda
font_02_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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