Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f82ccffdc8fc233…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 10:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7640507984ba7c0fbf2f4f1ad6dd9b72 SHA-1: bf1d812905b35b6eff1eceb974d206d7acf1f7bc SHA-256: 2f82ccffdc8fc233b597b8c74b60eb3f779c230f08636a870fafd8eb9e609679
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. The embedded JavaScript likely facilitates the malicious payload delivery or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://chcial.ru/uplcv?utm_term=converter+android+para+windows+phone PDF link annotation
    • https://sinarwaja.com/account/files/55594389661.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/61156757888.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/gitimibadegin.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/lazuzixonesobu.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/bejepuvorabulaxevu.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/60693372121.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/senivaxifekibeguxinawusuz.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/xaboduxekaw.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zinej.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5c444392---fezakegerepifuzaluwi.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/53806572373.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d746728b8---getasuxupafejidefajuti.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/28863839184.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7d914add---mifawitudofawewukiwesis.pdfIn PDF document text
    • https://papiratisk.cz/soubory/17754398342.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/95442886127.pdfIn PDF document text
    • http://wych123.com/upload/files/89412780947.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-5/20210905093104444730.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/zixoronabupen.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/kobuvixudazazofapovuz.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/21036995104.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/didutir.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/19518831731.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/87338514588.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/25741292853.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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 10628 bytes
SHA-256: 9a419afb23b5c2ad606737b6efbb263e5ef4868277d82bd684dd196b6bc92826
font_01_sfnt_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 17284 bytes
SHA-256: eda6438e96a607b4ef7e97a95b7d274f08bf04af6129c42b9da2ac0ee6761876
font_02_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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