Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8fb2616f6e2d61…

MALICIOUS

PDF

93.0 KB Created: 2021-09-16 01:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83950b0649eb551bfc466a1d098d5855 SHA-1: d94740fd7a866eff64de9dabe4e5c184a9b5cecc SHA-256: 9a8fb2616f6e2d61835c20576b743aaebffb47e6fb7307ffc8f0916e374f9c8c
174 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a lure for downloading further malicious content. The presence of a download button lure and callback phishing pretext suggests a social engineering attempt to trick the user. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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 http://vansuloi.com/uploads/userfiles/file/99242398054.pdf In PDF document text
    • http://mayinmaunhat.com/upload/files/44485081080.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/11116558735.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/15699404369.pdfIn PDF document text
    • http://zatacorp.com/upload/files/repipozorinunek.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/dowazaxuxifonafe.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/85899769495.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210907_5DA6F44DB66F94DE.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/57917345673.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/53457148776.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42cd2469f---nagebebefox.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426614069f6---gofolekexijez.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109160024332881.pdfIn PDF document text
    • http://jarosi.hu/files/file/57640811559.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/naxej.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/nenuporidasutanejomazamax.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/rewugotudikakokufamas.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/belesimajavur.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/16253969900.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/tokiliwusowakawil.pdfPDF link annotation
    • https://anglarill.net/userfiles/file/zepawuvilumawudo.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/wifalovozunoxezudopojal.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/ritage.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/garodafasadit.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/punixeta.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/jimeguri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+hitman+bodyguard+123moviesPDF 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_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 19092 bytes
SHA-256: dc46fb1ec00dfec99b308bc917b69e03e6dc977410400ef042d19dbc80e3f2dc
font_01_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9E 11376 bytes
SHA-256: a338badb549e5507049967eb6bdb87a77942cc807119854313a78b25cf70763d