Malicious PDF — malware analysis report

Static analysis result for SHA-256 580ca321403a0f24…

MALICIOUS

PDF

95.4 KB Created: 2021-09-22 09:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9fc11044ca7fadc29bffbc6f3642cdb7 SHA-1: cb9e1ed4ecbbb5856a70a99b476b8773ad3035da SHA-256: 580ca321403a0f241b7a35c5f83d6983cef471c5a8d36fd01349d737c4b61eb7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, a common tactic for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic suggests a phishing context, and the ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chulintemple.org/CKEdit/upload/files/56133253306.pdf In PDF document text
    • http://studiocalderini.it/userfiles/files/wipaxazavaragomalaruzin.pdfIn PDF document text
    • http://scarpatti.com/files/dudukepo.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/dovowetutomelezilul.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/numavapipetugibugotez.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/76416107789.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/29941028859.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/5343973694.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/65225539862.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/4498266705.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/xuxupobomuxexifekuvaba.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/35156402870.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/34907578806.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/purejujitofezurovis.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xavufokodujixaxotozoma.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/72555121556.pdfIn PDF document text
    • https://partnermind.cz/images/files/sopuxipavewunajaposupuda.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/29526198338.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210913095125.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/80754557228.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/040848511501.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/83872537573.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/gasobefibaxex.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/vinogosip.pdfIn PDF document text
    • https://songhongresort.com/img/files/97390868778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ncea+level+1+science+acids+and+basesPDF link annotation
    • 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_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 10280 bytes
SHA-256: cbfe85a792c129aea005304ea65948f002c296177d322bedb4cc6f4d1d4a7bf0
font_01_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 17772 bytes
SHA-256: a450a972bbcb576d987cace98b2f7dd9503e036ca4f4a75ef190621b8e459d16
font_02_sfnt_off00015755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1