Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc626a4d0a9337d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 13:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 362b8e512da7ac453a45b4fcae75b86a SHA-1: 29e438aaf10708beb1c8e354d1456d9e062b6d1a SHA-256: bbc626a4d0a9337d513291e7837e79fd4c9eafb53edfc7bc692d9f3bba7689e9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a link farm with numerous distinct hosts and the embedded URL pointing to a potentially malicious PDF suggest a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://kermiradiatoriai.lt/images/files/50151878144.pdf In PDF document text
    • https://zhansq.cn/upload/file/karumusizibovemepupiniku.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/92927488158.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136296d66ad5---30657779893.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/55090280840.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/22050645082.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/87961211986.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/32976814117.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/folodosedasiwafenarevede.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/85746509370.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/ruxorofenesilovow.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/jubemifupobanunet.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210912_102107.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/mudejubibatunirebuzeguguz.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///26394745894.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210909_55837BDACC36D085.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/4942720279.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/zutafepidopibidixadojalu.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/8115281332.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/52633055314.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/38390695136.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/23620220870.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/35703859580.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/53309954159.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/wuboxekuridujimagulizug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=burma+tv+latest+apkPDF link annotation
    • 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_off0000bb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB42 10408 bytes
SHA-256: f8afed109def59239579f3cfc3eab93b40550ca98ee14cfc0a777b850e1123ed
font_01_sfnt_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 16792 bytes
SHA-256: dad5432c76261992436afee2c50ed85971d8cefcb471e71770c56838bba0b892