Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff215e4254481f27…

MALICIOUS

PDF

85.9 KB Created: 2021-04-30 02:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a9ed49a124406dad417012e0bd06a13c SHA-1: f146ff23ff9def5d0b3e91b2a08b232014759f6b SHA-256: ff215e4254481f27ab3ad96f2d6c994757b0d342cb6b8db5b2dee51cef3133a6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/strik?utm_term=how+to+write+a+monitoring+and+evaluation+plan PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389097/normal_600519f77ab8f.pdfIn PDF document text
    • http://idealica-italy.site/zirupizinatumuxuvenesumukllol2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_604cd88744fc7.pdfIn PDF document text
    • http://heleogose.online/notification_bar_android_piezuin5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_6018a20971fde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_600c711e45530.pdfIn PDF document text
    • http://rastet-malysh.ru/how_to_clean_steam_iron_rowentaxlgq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_605d95293dd70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_602cf803634cb.pdfIn PDF document text
    • http://ompala.store/cat_stevens_father_and_son_chords_easysta2h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_6041c58fe6673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5ffe1293e0753.pdfIn PDF document text
    • http://com-servers.online/460641703960g2ow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452374/normal_5fdfc10cdb31a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_efadc359eaf44e188fe4a1c60e6f1f49.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_abc5d894f0ee415e8b8073cf26378c85.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_dbc7f75c2ea245dc8d5503bcce5afc19.pdf?index=trueIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_c2a966d355c94ed3b471f16d90e6a5a4.pdf?index=trueIn PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_b575bc1d05d94d01b0b8b8cd5c7965b9.pdf?index=trueIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_ac144ac059c246acb9e9ac380bbe6081.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 5212 bytes
SHA-256: a31cda8a4ca702dbd9a247793b300814a2378c1b314bdfc2744a0bc1cfc67349
font_01_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 11200 bytes
SHA-256: d47026b13fa2269dd07885e417ace811765d9a0aa3f94930ebe91af1244d800b