Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47d8ecc7c042558…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 04:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b6a791a24cc132e4980acd757191dac SHA-1: 81ba1c22a498221160e7176b2636ac8ce913eef4 SHA-256: f47d8ecc7c04255814c7e4c934824975df38e69191e1b3e92e048ff900eb2f75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs, forming a link farm, with one specific URL pointing to a potentially malicious domain. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://swhos.com/upload/files/85793819474.pdf In PDF document text
    • http://musicpark-live.com/userfiles/file/59333070496.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/34317101702.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/ziwivutolimijesowipabulo.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/jowomulegologugobina.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/63469948990.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/43883830340.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-11/20210911083401359529.pdfIn PDF document text
    • https://parkettworld.com/upload/files/ladegekavajikemaximilew.pdfIn PDF document text
    • https://olterus.org/contents/files/77765833575.pdfIn PDF document text
    • https://emenu.hu/editor_up/tatilujamatepoweju.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090806223759.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/30081922965.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/8702775922.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/solijogalexejiruvoxirep.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f50be7204---julolisubonov.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908181308.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/tovugekewalumove.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210903095040.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/redaxig.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/fekumur.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/37153633414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=red+alert+1+androidPDF 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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 18364 bytes
SHA-256: 5f77384535a39dcea59658726403a64769741424dd7b48b5b8ea66401b47c829
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 10168 bytes
SHA-256: 3b884bfc4d25a2b9c036f869f7b81e30ad34a601a2a442ce0319b23029ca20ad

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