Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffd99581104e234…

MALICIOUS

PDF

93.3 KB Created: 2021-03-30 11:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 94d007704b2b04405f3002356ef5900b SHA-1: cf2db453e7380aa66cf504414e166f7280d55d09 SHA-256: 3ffd99581104e234ea97bd67344cae50c7be9d271af0aab7ce63145c672facbc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/aws?utm_term=splinter+cell+chaos+theory+xbox+one+controls PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484126/normal_60449f5195991.pdfIn PDF document text
    • http://fotodosajube.22web.org/atorvastatina_vs_rosuvastatina.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/9161897.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/kigozesujubibiterojogekur.pdfIn PDF document text
    • https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/dazikanunenixul_dijalanar_mapegufifeb.pdfIn PDF document text
    • http://septiki-rf.website/duck_hunting_season_2020_illinoisd2tw1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_600e5cb5e8822.pdfIn PDF document text
    • http://simomezubuxo.22web.org/how_to_reference_a_book_chapter.pdfIn PDF document text
    • http://xexogafuko.22web.org/dp_pic_whatsapp_girl_attitude_shayari.pdfIn PDF document text
    • http://rte-ita.fun/45435758596jznsz.pdfIn PDF document text
    • https://sefujokugitexas.weebly.com/uploads/1/3/1/4/131408298/lokuderabexe.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/pizijivolelujenoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fd1b8e652d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_6017dbe78013d.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://silapopo.epizy.com/cyberpunk_2077_release_time_usa.pdfIn PDF document text
    • http://rileponabamel.rf.gd/kuferodilobe.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_0233290d75e8453baf474ec733a4f55a.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_28abe71eb4794184bb3ee85eb03a8783.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_daa9479467a7453c9d680ac4315c7679.pdf?index=trueIn 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_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 5224 bytes
SHA-256: 792f223ab921e21d75cd3739d0331c4abbaa90c229831f30e560032e5d7b4986
font_01_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 10424 bytes
SHA-256: a9c586b5513df8ede1fec1ca197789a1c3e5a56f81dd31d9c02dfd62a7c288b3
font_02_sfnt_off000158a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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