Malicious PDF — malware analysis report

Static analysis result for SHA-256 545001a4cc826a1e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 14:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7acc1438610c23902439fb0ff8e14c80 SHA-1: c5ca35e4c93c9f6348173fa5ccd597a92a1b93ef SHA-256: 545001a4cc826a1e650eae7cc8a2288103b6e3a41ed43c2b921ea1286a0ee77d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files on potentially disposable domains, suggests a link farm or phishing lure. The 'Urgency / deadline lure' heuristic further supports a phishing or social engineering attack pattern. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/23591942104.pdf
    • http://cpgny.com/userfiles/files/12395676839.pdf
    • http://parikshitconstruction.com/uploads/vurenekigubamovezufesux.pdf
    • https://szabobuszrendeles.hu/files/files/58266788405.pdf
    • http://naoshima-tours.com/images/blog/file/92290752648.pdf
    • http://harekatmemuru.com/images/Media/files/83137743648.pdf
    • http://boldogelet.hu/media/jugiweweb.pdf
    • http://transporteslaplata.com/imagenes_web/file/pogipoxodegererototeki.pdf
    • http://ppogrimall.com/upload/editor_image/file/68451866845.pdf
    • http://vswet.ru/f/75373034474.pdf
    • https://idealist.ro/userfiles/file/48593344782.pdf
    • https://bliznacite.dvsportbg.com/files/jaxidirona.pdf
    • http://gd-weimi.com/upfolder/e/files/20210911035953.pdf
    • http://epodhajska.eu/UserFiles/File/domeribejamuzidofevilak.pdf
    • https://oxfordjsr.com/userfiles/file/ditedudovunokasigexa.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/74006100169.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/kofikizipufimerevumopozud.pdf
    • https://takarasushimn.com/userfiles/files/wuferok.pdf
    • http://odpadykj.cz/UserFiles/File/bademesulunojuwibiveziwi.pdf
    • https://susta.vn/userfiles/file/jijerukebiwepewemazuki.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0310e272dd51d78b1bc0909cecf0b4e3/27965308078.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/66669618987.pdf
    • http://machinesupplier.cn/data/product/file/2021914_165842_716.pdf
    • http://kindergartenhelden.at/upload/file/55048018539.pdf
    • http://francescofesta.it/userfiles/files/xikemozibejunolela.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=guitar+tuner+free+apk
    • 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_off0000d85d.bin
28e28710f3ebcff36c57a4fc862a75c88f2b32ebb943f31642887a646275dd55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 18712 bytes
font_01_sfnt_off000109df.bin
1f5bb60efefeaf73b0cc245087f0711d067c86b48073917c28c2f9cdd5b729f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 10248 bytes
font_02_sfnt_off00012105.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 16792 bytes

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