Malicious PDF — malware analysis report

Static analysis result for SHA-256 81778f174499cad4…

MALICIOUS

PDF

71.1 KB Created: 2020-12-07 16:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1dd96aa9f483b2509c09bce2846ba463 SHA-1: b7a1810702cd9cf72b1065049548bf6dd4078219 SHA-256: 81778f174499cad4f63d2a76e1800f1a5a24a302bc53c25530f8fc5f3be45903
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of external links, with one pointing to a URL that appears to be part of a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://trafficel.ru/strik?utm_term=the+complete+idiot%2527s+guide+to+chess+pdf PDF link annotation
    • https://kobigaxa.weebly.com/uploads/1/3/3/9/133997295/faf8e095c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fbc56e425341.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/76171ec1dfc1c95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413966/normal_5fc7e946aeb92.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/2cf60487-1acc-4cfa-9afd-ba3d70c09a3b/jugifogigugejokex.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/44089886277.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/safizipedixomubajogovivun.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/chemistry_form_4_chapter_1_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/mivobu.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/diare_akut_pada_bayi.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/situmizabinubibabu.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/affine_transformation_parameter_estimation.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 5248 bytes
SHA-256: 69c2fb39b2869c341bb55ad79f0512ca1bd1969b56c19e7fcce0a975a0ebac74
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 10532 bytes
SHA-256: 555f60b7d7e583212a96f7be60b3fde3e351572bacf1d1e745e206bac1b3b3e5

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