Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adce28fa258ce3c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 02:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d058312c68fe4e474a07383be245433 SHA-1: 92e47258fe17f230d928c4c370505c621235b31b SHA-256: 1adce28fa258ce3c04a8cf6f5b27ec2b2058cee9ac1adcc542f825f26881c296
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or redirect users to malicious content. The presence of JavaScript suggests it may be used to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=how+to+watch+big+brother+on+firestick PDF link annotation
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bb8e4d0d---66950923763.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/zaxokatenevaxinepabu.pdfPDF link annotation
    • http://solarexperten.ch/fckeditor/editor/images/file/73865217142.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/59394260225.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210921020923_mxwg7y.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/37223913680.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/selaragovaretamelakuwe.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/52304659403.pdfIn PDF document text
    • http://techbis.pl/files/file/22372032728.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/74631751596.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/mubidul.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/gizon.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4b8377242d7de77584298f5c2df6ee4f/14821176241.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/xadaji.pdfIn PDF document text
    • https://chineseclothingonline.com/File/watowisudolofofesovotosu.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631836723.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/niratanememuxamokovomoj.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/33656190806.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/sadibevudiv.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/fitozinovafefafal.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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 17780 bytes
SHA-256: fa3e25c283764c192b3aa73e2355aa0f643d69fb4d1d9a042a063895a31fccd5
font_02_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10880 bytes
SHA-256: 7215e88b994ee0a6f88d6f004954580abf008aa1d3d20fb3b0bdeb821314aa61