Malicious PDF — malware analysis report

Static analysis result for SHA-256 504bcaa3c50116cd…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 11:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e3c19d1ef67e5e502291deedbf92a34 SHA-1: d06dc49128838cec5df71d710e3c5a8f84f9b3a6 SHA-256: 504bcaa3c50116cd95a52004aaa49279a78d5b379159fd1792f8581fffc96cd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a phishing lure. The presence of 'utm_term=ransom' in one URL hints at a potential ransomware lure. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=ransom+my+heart+pdf
    • http://guanzhuli.com/userfiles/file/xanorosadoji.pdf
    • http://d-a-s.cn/userfiles/file/wafufesila.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0912/4ea05c6d4c8d6f6e829c8f88f4e59cef.pdf
    • http://www.gonouvellezelande.com/files/48323026676.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/52008729180.pdf
    • https://manorhair.com/uploads/files/202109110244537441.pdf
    • http://dinskayarealty.ru/media/file/91880691895.pdf
    • http://bordahusfeldolgozo.hu/editor_up/fojufubalilanazovonev.pdf
    • https://damsindia.org/admin/uploads/file/35804523785.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_E8949F6D2DCEBA0A.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/mikanuxotonusanukadarawar.pdf
    • http://milwaukee.center/userfiles/file/dagamubutinajevunis.pdf
    • http://shiny-baby.com/fileimage/file/kelajexejavepiririkanufot.pdf
    • http://distant-property.ru/fck_editor_files/files/vopoguz.pdf
    • http://md-servicios.com/userfiles/file/zupilalexasarefe.pdf
    • http://hcvitamin.com/webroot/img/files/fagalibofudufapovavobozet.pdf
    • http://protetyka-lublin.com/images/wyswig_images/file/66063967227.pdf
    • http://flairpens.ru/uploads/file/50177691757.pdf
    • http://badaranquehablar.com/userfiles/files/47359822840.pdf
    • https://showdetango.com/bafa/userfiles/file/rodovuxipepuwaxoruda.pdf
    • http://rnralpha.cz/res/file/wotafugadaviwubimulabupiv.pdf
    • http://enewind.com/pliki/file/jugikaxiziligenetarus.pdf
    • https://cepatdaftargroup2.com/contents/files/zenigoteroxaribobojew.pdf
    • http://fine-cottage.ru/userfiles/files/ruwapimivurawajegur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3dd.bin
14d32a714bfad41eb855ffb6cfdb58caff57bd9cafe1c081031e9a5aba500340		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 10784 bytes
font_01_sfnt_off0000ec93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 16792 bytes
font_02_sfnt_off000104a5.bin
7bb0d868769424eddc7ac11565780dcaf4fb911b8e181dc8132c22c9cce42b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 16636 bytes

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