Malicious PDF — malware analysis report

Static analysis result for SHA-256 df83126c43305c42…

MALICIOUS

PDF

76.2 KB Created: 2020-11-28 08:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cb255eee5abbe9b56690da5288551089 SHA-1: dc597f668df6334e67bf77276caa93269de9f314 SHA-256: df83126c43305c4272b3c6880ecaea11d0bee7ab4dbf63875e2b9bbe2a4dccc3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/strik?utm_term=cintiq+companion+2+specs PDF link annotation
    • https://gowukamumikezaj.weebly.com/uploads/1/3/4/7/134769013/nevotixonujaw_wowovi_goruf.pdfIn PDF document text
    • https://tazomisoz.weebly.com/uploads/1/3/4/3/134344853/fasekalit.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/zuxofomuvu.pdfIn PDF document text
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/bubalakewo_tulugevulub_moxujil_robatexuzukemi.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/xixofinerezexix.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/vilagonapik-muvoveworoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/63574307-de3c-4b2e-b24d-fd81eb454a3a/22887868380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956cadac-5093-4810-a580-8af62e882802/at_the_mountains_of_madness_comic.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/whirlpool_ultimate_care_ii_dryer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/17061279450.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/bioorganic_chemistry_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59768326-bab3-4e97-bf9c-fc9ec42fb489/beginners_guide_to_archery.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://scripts.sil.org/OFLIn 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_off0000d17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17C 5116 bytes
SHA-256: 0ebf1c49b3b8cc1fb103ff44988b193622415a8ca4ce158b7c6af1fe8df01134
font_01_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 14160 bytes
SHA-256: 7bdcf5cd8647fff2e224e1b2a158936633dd25f7a392492ac00024cdb2998a5b
font_02_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 16060 bytes
SHA-256: 2cca29575edef7a9880cf400a7847cc5df22ba1ee7edc19c7b9bafe603f6c979

Open this report in the interactive analyzer, or submit your own file for analysis.