Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd509c41818abfb…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 04:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b3461d447d34057a5c3c0c191feb6b7 SHA-1: e371c806cab133c1ec6ffc637522bc04a271fd23 SHA-256: 3bd509c41818abfbcbb21e87b6d326bf5b9ce44625c1774c9aa0ace4eed02221
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the PDF structure itself indicate an attempt to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier strongly supports the malicious verdict.

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
  • 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 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.
  • 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://yafferge.ru/award?keyword=digital+height+gauge+pdf In PDF document text
    • http://jifarobajis.sportsontheweb.net/html_label_font_size_and_color.pdfIn PDF document text
    • https://cdn.sqhk.co/padekopa/Jhbuja5/picsart_full_unlocked_apk_ios.pdfIn PDF document text
    • http://bimadepunepi.mypressonline.com/fedezotukul.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/xigidatolekad_nanov_xotapefakina.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/7jjiacw/moratevugoteta.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/1872920.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/Qigibvs/kodekefuwizupunise.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/zalejeburogozevoro.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/jfIgehj/nosisakapetiro.pdfIn PDF document text
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/8470122.pdfIn PDF document text
    • http://ferejupaxebul.iblogger.org/how_many_social_workers_in_uk.pdfIn PDF document text
    • https://gapidegit.weebly.com/uploads/1/3/1/3/131379699/sizezokeri.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/8ib1iKC/64424668619.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/f5560440-cde4-4d34-a118-675386db71ca/22648788078.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/serilesorudobakarof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ba3f81-2afc-4072-b642-8b76bf6f8489/how_to_compress_an_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/kekemozibutujokumexofobig.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/43510182596.pdfIn PDF document text
    • http://wekidezeze.epizy.com/bose_quietcomfort_35_bluetooth_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/10212513004.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 5028 bytes
SHA-256: 0d88da0d3bd04147eabd617ee28aa96c62f44a196d37ee760a8fbdfe504bc1f2
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10564 bytes
SHA-256: c157e6a6d030f0eb882bd9b0aacd43bd4a67bca538f92e8966301c992decba94
font_02_sfnt_off000125fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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