Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abe939465c2f651…

MALICIOUS

PDF

87.0 KB Created: 2021-09-15 20:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2f38b86cb8124460d5a2609f999d973 SHA-1: d406b10c81a17a8e31c122a93b4769fe62b8fc78 SHA-256: 9abe939465c2f651f013aaa8e80682c986e230e1a59b7c27ea276de4a9f6d3d0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a number for a fabricated issue. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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 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://oniceh.ru/uplcv?utm_term=challenges+in+android+app+development PDF link annotation
    • http://amicissiapiemonteisa.it/userfiles/files/moketasusenikubewekiti.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/5542673190.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/viziputosofib.pdfIn PDF document text
    • http://canvangdientu.com/images/file/povadezegen.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416d0f435e4---62129955828.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/patesigebufidagasafisato.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/rukowalazevulapi.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/masikaluvenojorovobu.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/lokejeludobatonorer.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rakiduwa.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1464d8988---33859953323.pdfIn PDF document text
    • http://citty.org/images/uploads/file/61594745506.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/pigitere.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/48044156249.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/4810464412.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/bowivuxujuwefevesojib.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/bizomokimezaseta.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/64828869105.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/68762584582.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/kasapufenekufepoluzapuxa.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/50864232270.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/foxoxubamowaribe.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/14881811219.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/90627757721.pdfIn PDF document text
    • http://gr-chem.com/upload/files/bapimegoruxokumapane.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210904063708.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163105888198878517943.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_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 18544 bytes
SHA-256: 93f8e56a78f19b08319dec71ba14a10e5ce9e75521a2a37e9c89132114ee0b3d
font_02_sfnt_off000134c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C1 10936 bytes
SHA-256: 002a58ddb073d9910210f8f34886501a2ce92a9ed3f1e31c258bd53302c5ce59