Malicious PDF — malware analysis report

Static analysis result for SHA-256 8501cb179065f865…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 01:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe170217592cbe3ead52d3ef2901dce9 SHA-1: 5b164e415ebf74e2b7dcdb8f6d34eff1591db026 SHA-256: 8501cb179065f865be64107ecb763e5280d1f5fa2ade0243e078a6937eea43df
182 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains heuristics indicating it's a link farm on disposable hosting and uses lures like a "download button" and "urgency" to trick the user. The document also mentions password-protected archives, a common tactic to bypass security filters. The primary IOC is the external URI pointing to a suspicious domain, likely serving a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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://allytemp.ru/uplcv?utm_term=delicious+retouch+4+crack PDF link annotation
    • http://bio-scan.com/userfiles/file/megimajadirusuzadefazuf.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/93775895169.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/1830620339.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/nenotopozasorami.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/pofonemoxomoludumuvozap.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/26743435289.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/86671029550.pdfIn PDF document text
    • http://belniig.by/public/file/27074383937.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/xasid.pdfIn PDF document text
    • http://lovesenergy.com/file/luzegolefusoxatosanuzixu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca1668829---54160008407.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/94148726823.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/43399683124.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/57030797686.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zakekafupojenovik.pdfIn PDF document text
    • https://indreninepal.org/userfiles/file/gobilipiridi.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210918_FA5E0D1CE6BD79E2.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f29a5a31---65055998417.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/52930236790.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/vikinenap.pdfIn PDF document text
    • http://zerosquareonline.com/file/80562297716.pdfIn PDF document text
    • https://rm-parketi.si/uploads/pagafobu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 18244 bytes
SHA-256: 615b68ca9e4a93c35dd2ca4af499ef8c181b17022c49be2a42cbc0f1a297f779
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 10496 bytes
SHA-256: 6c47c953b93ab22044aa844a5217640312f4c7b6d113b76fc098954e5c11ab08