Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc1c263e7950ee6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 22:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2d364f0aeb11c527b9ccdd7a7ee1f14 SHA-1: a71fd08b6081699acb9b925ddfd39ac4ace290f3 SHA-256: cfc1c263e7950ee6025ff8f85226ff36f7a67185abbe38c5ab5efc49c8205670
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious phishing content. The 'SE_CALLBACK_LURE' heuristic specifically indicates that the document prompts the user to call a phone number, consistent with callback phishing or tech-support scams. No scripts were extracted, but the presence of many external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=mullaloo+surf+cam PDF link annotation
    • http://okzawidow.pl/img/upload/files/zutogujitu.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/36178011999.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/fexovepi.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/56628515124.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///86587978939.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/21333208342.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910085135110197.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/xitovuxowipav.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/33948004392.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/widukilutosegesebere.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/30046715798.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/44551687452.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/af15401e382a05bcb6ac6f457738088b/94728778438.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/11122752332.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/bekonusipexavusesazagujaj.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/15267425308.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/3351062758.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/pibaj.pdfIn PDF document text
    • http://thevale.us/userimages/89338147040.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/36282496704.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vibapowudivem.pdfIn PDF document text
    • http://gptools.net/userfiles/file/xusifivokulolo.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/kepulesutebuv.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130ebdf47c14---batorufuji.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_off0000b684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 10164 bytes
SHA-256: 74a5cb686568021327f9126175992a9661f61356d8ce0e177d894a019a8329b8
font_02_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 16028 bytes
SHA-256: adfa07195e983b598254c5c99fa9b0e6de8fddde18f8fb01996f415b67f7a271