Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5c47edfbbb5657…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 00:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5be41a28172213d17b0144b9ccbbb741 SHA-1: b818a1b227172954c95655e64453544040f367f5 SHA-256: de5c47edfbbb56575bd5afbe696c63a66e9f2ace91b66faa915483bc2b110677
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document's structure suggests it's a link farm designed to redirect users to various PDF files, one of which uses a raw IP address, indicating a potential attempt to host malicious content. The presence of embedded URLs and the heuristic for callback phishing lures strongly suggest an attempt to deceive the user into performing an action, likely related to financial fraud or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • 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://csc0532.com/userfiles/file/20210906201436_dvhrpn.pdf In PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/falaji.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/xemefewosetelutifa.pdfIn PDF document text
    • https://felicityokolo.com/file/93536934095.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210901111232_rtbopf.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/toxatefodeza.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/juvagidiw.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/movujajez.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07dcf0473---lezisusulam.pdfIn PDF document text
    • http://honkakuji.jp/honkakuji/images/ckfinder/files/kawobujesivagerepafaxa.pdfIn PDF document text
    • https://shinaltd.ru/images/file/ropaz.pdfIn PDF document text
    • http://jar-ted.pl/file/25689316084.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/73902679445.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/gejolubeluvupito.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/depujara.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/1544783590.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/95537781960.pdfPDF link annotation
    • http://malabarisproducoes.com/arquivos/files/favarupo.pdfIn PDF document text
    • http://pololanna.com/user_img/files/40580027929.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210903003321.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132755f806d8---metedabinafinaxipofu.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/wirinus.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/81552086064.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/duzipafuxadubugupexej.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/86976418920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+projects+with+source+code+for+final+yearPDF 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_off0000cd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 11128 bytes
SHA-256: 0fdefd417787edae7dc3d20ca4e6f7889f8b5aad27ac97e665907179cdc18593
font_01_sfnt_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 17876 bytes
SHA-256: 1ba9f80b44626256f702fb5d6fbba48433b82bd17ca59617a8e65d9fa9b9b8b2

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