Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4981edfb7a06d41…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 04:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b5b842a887da229404fda143524bb812 SHA-1: bac715d79eb498f1ee6c3fbfa6c6dfd2da235f64 SHA-256: d4981edfb7a06d410af88a9730df3fa25b7ce8e4149aafdff0aa70a09e52a166
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_IMAGE_LURE' suggests the document uses a visual deception, likely a screenshot, to encourage clicks on these links. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://wastran.ru/uplcv?utm_term=the+little+lisper+pdf PDF link annotation
    • http://ekouklid.eu/UserFiles/file/zojunenusupogem.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/67992719393.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/pibovokalusegesotewamodul.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vodewarotaximefaji.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/faxedofavijuxo.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/74025677004.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/6994777758.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/50028335500.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/nulukewogizejebepi.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/kikomobop.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/38654455285.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/betuxogimegerap.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/damiwonari.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/wasoxuvarajisaxo.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/29362846563.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/53226796237.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbe1b7a48d---91303259634.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1f9c3729---6413344353.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/vifadajegajewi.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sikarijoxisuvoritebuda.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/59008030570.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/viwim.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/rabowok.pdfIn PDF document text
    • https://terracell.pt/images/file/sifememutagemabafaxunu.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_off0000adc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC0 14652 bytes
SHA-256: 0fcdff3062ee83898a8c289ef9737ab38ca218ea5927ae547c2be36f06a8f9e6
font_01_sfnt_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 10172 bytes
SHA-256: 16996134a1eeceac631baf31bbc35b10f0bfa807094a1e32a373eac486caa815