Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3388e6055ca3f8…

MALICIOUS

PDF

81.1 KB Created: 2021-10-08 16:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2374064fc41bbfa822cd1ee2c530a3bf SHA-1: 4326a2147c87ec3343e317bd6e34e1e3aba742f3 SHA-256: 7f3388e6055ca3f88c386ebc7f810dda720519a28e66e64c48fdb17a53617a7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the link farm characteristic suggest the document's purpose is to redirect users to potentially harmful content or facilitate SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=call+of+dead+characters PDF link annotation
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/42900437180.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/kuvokulotugujonuxedir.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/54384478503.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/wirexulowul.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/xurimivejewikuvevureked.pdfIn PDF document text
    • http://rakuteriyakicanogapark.com/uploads/files/12852944283.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/96712770414.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/toj7pkpvcliorf3p82kvnt3sb7/48958592473.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jujonupisuvukuxopuxaza.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/pivaman.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/pojotetonisobovupup.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/97504826194.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/47732309166.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/78826145520.pdfIn PDF document text
    • https://telorgabus.com/contents/files/90224841519.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/31033783731.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/gedonelidogaw.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/62226452170.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/getutevijabojabizibumoxe.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/71777353153.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/zejoxerutuwepimez.pdfIn PDF document text
    • http://deforma.it/userfiles/files/59196339330.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/jivejugiwixiditelisubek.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/xulixolelux.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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 10408 bytes
SHA-256: 8a795b0b96d0ec2ea2b0b9bff4a14d6818fa9d10088d8f2940454d764e1171a6
font_02_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 18336 bytes
SHA-256: 250d14865e8ec855e70c8aad455802069553908f483ac4d30244b36decf4828b