Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d5f415525c434d…

MALICIOUS

PDF

76.2 KB Created: 2021-11-04 06:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 764ab6820c85189d254baf89bd91fc43 SHA-1: b1a9f4d7098d3e41aa605d28ad29cbbbfe7b670b SHA-256: d4d5f415525c434df818ef9ad6a8eba335cbf487959216c6b441ff7b2c758cf4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://peltonfell.org.uk/ckfinder/userfiles/files/68039944598.pdf In PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/devomuxuluwoxo.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/51609700789.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/junafuwof.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/pineziduniveg.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/sedumobejegidejo.pdfIn PDF document text
    • https://bnovum.hu/downloads/benotima.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/wopaxutinizakezeligabiwi.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/82571755060.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/28349137948.pdfIn PDF document text
    • http://dalaichau.com/files/womodozowuzageponi.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/mejivaravagipur.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/52753750195.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/55989423303.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a0a49692---penuzewa.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/85318267980.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nunosunepagirafeb.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/12361755293.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/foxijojabemubonet.pdfIn PDF document text
    • http://bak.vn/upload/files/zevorunakosepobo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/032b3b3c2e03e75973e9840983cb7867/sejajutitatelexiro.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/6925083653.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=played+the+flute+crosswordPDF 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_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 16764 bytes
SHA-256: 82ba609e840fed7bc8df413ed506c7fdd2f0b6fdf691e2ec213801c46bccce4f
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10676 bytes
SHA-256: 7f15c56f4a38cd80905ea1460d05a6e9df7b3991a79d02ea79b3e19d70e289e2