Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8d2e03f2d91652…

MALICIOUS

PDF

74.8 KB Created: 2021-02-17 15:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d0f26b2f3e2d4906b7a79fb684b248a2 SHA-1: 2356dd11222492c3391c613fa0f701fc9b55ac66 SHA-256: cd8d2e03f2d916526c90361f221d889b1b9de2c120a32a1d1e2dda158feb536d
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, many of which point to SEO-optimized PDF documents, and specifically includes a URL designed to redirect users to download an APK. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's intent is to trick users into believing there are new payment instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://bologen.ru/wix?keyword=pay+box+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416493/normal_601bb725288b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_60076f3955898.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/7852568.pdfIn PDF document text
    • https://gonibulurigudum.weebly.com/uploads/1/3/0/8/130874364/0304fd599153.pdfIn PDF document text
    • http://circulshtangcalip.website/22273033806qsxow.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/jokojilejaxiboruge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fe303abbe98c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5ff3bcb9d7a15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5ffcf7a2f38b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384652/normal_5ff4fbce3cb9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5fcd5eee60dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5fe956c22bd51.pdfIn PDF document text
    • https://digakope.weebly.com/uploads/1/3/5/9/135974251/531982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lezerawe/dawakagiwax.pdfIn PDF document text
    • http://kuxadob.rf.gd/59034006047.pdfIn PDF document text
    • http://vumafovixono.rf.gd/56714386983.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/arborist_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/rinalixer.pdfIn PDF document text
    • http://sitejaxikezo.epizy.com/dabazodadegixopisidebo.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/subtraction_without_regrouping_worksheets_grade_2.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 4688 bytes
SHA-256: bed1627ce7aeeeb0d7dfdc372c91c2901512a803964efeed83ca06a01c83e8a8
font_01_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 10136 bytes
SHA-256: 40ba6c184f3645fb00621601555293748c455be95f7a78c7e77fad11dc4d648c
font_02_sfnt_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c