Malicious PDF — malware analysis report

Static analysis result for SHA-256 61084bcbc101fa9d…

MALICIOUS

PDF

71.9 KB Created: 2020-11-10 05:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4ac39f69d1447e4e7972511ac6591db5 SHA-1: 346642b63be5c39440cfc813f6ffc7bdbd93b832 SHA-256: 61084bcbc101fa9d7c845edbca9f0c6a81d917c5ae3df89c1811b900ed57e0af
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation to drive traffic to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?keyword=bejeweled+classic+free+play In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5f9000ae08ecb.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/81037f9bf.pdfIn PDF document text
    • https://judunelikirolo.weebly.com/uploads/1/3/4/3/134375477/ca1ac0.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/4106527.pdfIn PDF document text
    • https://vakasuvarepem.weebly.com/uploads/1/3/4/3/134328097/2e7aef327dfc20d.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/nagoduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_5f8fca31debac.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/nibuvu-jefeboripiriw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5f93a91680fbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9addd636-72be-488d-93f8-7623728c792a/73759373047.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/handmaid_s_tale_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/53811908856.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/totezidejerezaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/sadogijipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed00be76-4f46-4c87-a8cc-aecc5cdde126/location_of_new_manila_airport.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/36207065226.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_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 5468 bytes
SHA-256: 6673d11af17d1299cc60e2fcf58ce0cf599ca02985ceb715f6f8de2f2e6703fc
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 11180 bytes
SHA-256: 092fc6a0d58d1ecd0a316b23b1a5fe5999e0385350671086f0138131df06afad

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