Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d955aed646fff2…

MALICIOUS

PDF

72.1 KB Created: 2021-02-16 10:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 744b53813093b6dff414dc04f8af10ba SHA-1: b2e3b1a22cd8e8bf0d9f65df1e642533fc485b36 SHA-256: f9d955aed646fff29904cb9311065f13eb6c27c542239c83e813a967a9f832d2
226 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a lure for multi-factor authentication or one-time code harvesting. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to phishing sites. The primary URL identified is https://seumenha.ru/123?utm_term=which+roku+models+support+apple+tv+plus, which likely leads to the credential harvesting page.

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://seumenha.ru/123?utm_term=which+roku+models+support+apple+tv+plus PDF link annotation
    • http://psylath.com/18244976081d0mfj.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jajbLhC/how_to_cut_shapes_in_powerpoint_2007.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/2Pw5rjg/53183262207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fc9617441942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fd06bf1932fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367278/normal_5ff595a0d6128.pdfIn PDF document text
    • https://majosipodolonax.weebly.com/uploads/1/3/0/8/130814003/61275081042.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/94c9a40d31ca.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/uidai_aadhar_self-_service_portalbhdal.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/89524804090ymyhx.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/gdIBijO/knife_block_set.pdfIn PDF document text
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/nipexumetumaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/giKWLxb/xonixesevoxunatenuvosav.pdfIn PDF document text
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/xutifujitog.pdfIn PDF document text
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/7232150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5fdb0f00a40be.pdfIn PDF document text
    • https://bulodogezuso.weebly.com/uploads/1/3/4/8/134868115/e2f71f7e.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/32de0d42317.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/kuropudepopixu-lititusugimul-boxedofojuke.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/ieiiIjd/jivuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sibexelopuni.epizy.com/behringer_x32_firmware_3._07.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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 5448 bytes
SHA-256: 261cc0ddfcad0dd00d2437ad7519ca2a333464ca4e9ecccebe800d4118401d20
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10412 bytes
SHA-256: 5be5a27c9ace34630f7f132f7072bcc57bda5ba8f54a5d9fd9f6800ae1db89ae