Malicious PDF — malware analysis report

Static analysis result for SHA-256 db31617399d303ff…

MALICIOUS

PDF

83.1 KB Created: 2020-12-26 05:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 81f37cdd7009ac94a389cc2fd5c29199 SHA-1: 2a13cd836b0b1e33891a4608a22ae91131661540 SHA-256: db31617399d303ff1b464c797cb5682656acf6729b24ed531ecf687a604080dd
314 Risk Score

Malware Insights

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

The PDF contains multiple embedded links designed to redirect users to malicious websites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and SE_PAYMENT_REDIRECT_LURE heuristics. The SE_BRAND_CREDENTIAL_PHISH heuristic further suggests that these links are part of a credential phishing campaign, impersonating brands like HSBC. The ClamAV detection confirms the malicious nature of the file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/6470528.pdf.
  • 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
  • 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://gettraff.ru/strik?utm_term=neighborhood+credit+union+wire+routing+number In PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/6470528.pdfIn PDF document text
    • https://gubetixe.weebly.com/uploads/1/3/4/3/134314982/2222735.pdfIn PDF document text
    • https://serorufadorulu.weebly.com/uploads/1/3/1/4/131483245/vonexebopoxim-tukot-puzoniluranevij-lipatilefap.pdfIn PDF document text
    • https://nulabelavomeviz.weebly.com/uploads/1/3/1/4/131413951/1271736.pdfIn PDF document text
    • https://lopuzidijunusi.weebly.com/uploads/1/3/4/3/134378181/kolitinutiben-zolobeboxaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fe412f036083.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/genakafas.pdfIn PDF document text
    • https://zesawomu.weebly.com/uploads/1/3/4/3/134321331/1514869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fd92571c0dd9.pdfIn PDF document text
    • https://pebetojakudasud.weebly.com/uploads/1/3/4/8/134879391/vulasakizuromotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/nsf_biosketch_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/92547653130.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/70918510188.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/zedoponajuvu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 5136 bytes
SHA-256: b63a34e0e3fe3c2ea5d5b2715f1fc87bf89fe73b998c597bee5d3b13eba6ea31
font_01_sfnt_off00011a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 10824 bytes
SHA-256: 1ba75a82cdf2e189d3a002ed51a47f0785e4648e37de6bab6fdc3e2955cd6b08

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