Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdfef1e837ff888…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 02:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a444832263ad02a1f99556101559f89b SHA-1: 53f931a0047a839918fb9cbe33e13fd4235323c2 SHA-256: 9fdfef1e837ff888967215385b6841e0e54ab06465df58ec4537e3bbfe873683
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URIs and a link farm structure, indicating an intent to redirect users to external malicious sites. One of the embedded URIs points to a raw IP address, which is a common tactic for evading URL-based detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=anime+app+play+store PDF link annotation
    • http://alarcon-v.com/editor_upload_image/file/83936909920.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/balasusigubogojexulaw.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/fikibodumabitujurojudofak.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/86233246853.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/85974156377.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/titaloje.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/wifeko.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/23137221945.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/wivufidagam.pdfPDF link annotation
    • http://sosonomo.com/ckfinder/userfiles/files/61146242698.pdfIn PDF document text
    • http://getdol.com/page_data/file/35085386637.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/vejuneluboboz.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/12893764335.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/44373827059.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/84127841228.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109032056143947.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/236811378.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/sizusarurasepigaloviv.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/50965964832.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dc2f9378af9112f59659a7fb57aca3d6/dozado.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/79978162031.pdfIn PDF document text
    • http://aquatherm-graz.at/files/xugepejiduxiwe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9baa4d848---43811911926.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/ludegemugili.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://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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 10508 bytes
SHA-256: 928b09701063959c7239c5d0daec041d0fd669782dd968dfe8111ac10834e9bf
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 18388 bytes
SHA-256: 81c76892c010d673d3d1659cdc8bb7d4fbf48acb287be8ecddfb53fce03b2612
font_02_sfnt_off0001241f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1