Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ee49fed3824104…

MALICIOUS

PDF

85.5 KB Created: 2021-10-16 07:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f04f8fce11e6b3add0056d88d99c32e0 SHA-1: 0e85023086013294e19d626ee44cac1cca2b15a1 SHA-256: 71ee49fed382410472e468685cb36e49e85a37f512f1993f05ed560c7e6a53b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, suggesting it is designed to redirect users to malicious sites or initiate further downloads. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is intended to trick users into calling a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=dictation+of+english PDF link annotation
    • http://hepiran.com/cache/fck_files/file/tisuvugejifimupubiwatopa.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20211004054317.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/tevipujus.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/jezivejewejisoru.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/riwiwepipu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/13456525807.pdfIn PDF document text
    • https://viettrungson.com/media/Files/15113930168.pdfIn PDF document text
    • http://floramarble.com/uploads/62802401031.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/9815819103.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/61429001920.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/5008826551.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/wipudekerarodajove.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210921_52CAC2B4DFC29B0D.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/bupop.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614d56f7ab2a3---wotawajuwisunit.pdfIn PDF document text
    • http://cke.hk/userfiles/56291681251.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/56892762387.pdfIn PDF document text
    • http://timebymtm.com/upload/files/biresefuvowegap.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8668c0dfc3fa12c8d757cc2afb44515a/97456451001.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/24346640636.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/47691845428.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/vorimugolo.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/52160615350.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/jisupowimizejul.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/46757162757.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/8108101682.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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 10516 bytes
SHA-256: 263f5d59160043da05c255f2948c232b071aec12ec1a9d8bb76078138c47cb00
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 22084 bytes
SHA-256: ee9c2be56ebc76a36acc2e60366ebf62833934d3128c4747ca05bd9ba86b19a2