Malicious PDF — malware analysis report

Static analysis result for SHA-256 d168ac3599b96f38…

MALICIOUS

PDF

69.6 KB Created: 2020-12-15 12:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e1843c8b1c4546ce08570b989c371644 SHA-1: 98d3329f5c891cb8c6e197274d86905e1f261be5 SHA-256: d168ac3599b96f3831056328af6ef7fecb42b8ca52dc94b33751226f7c5f649f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafffe.ru/123?utm_term=pdf+to+csv+software PDF link annotation
    • https://mikezopa.weebly.com/uploads/1/3/4/3/134366842/vonodurowedola.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/ridirazowogezugak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_5f9c74d60532e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc109232cf09257bd6ccb44/t/5fc21c3d3570fb44d14ace87/1606556734443/the_to_do_list_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/rinazimosa.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/88389066428.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/82091751117.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ba7e0a2757459b03f866/t/5fc7da5f2431962c2dc57339/1606933088194/21017282096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9525459a-4a78-4c43-9a59-39f6eac5273d/12976226905.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/functional_analysis_system_technique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c754f7fd-2390-411d-873e-71309d9cb759/ratudisokugipazuguwabozek.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/29225348574.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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 5136 bytes
SHA-256: 1ee80a9d7f1dcb89be00ac890f6ff99ffa457380c81496fac7ae3e6446e98cf5
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 11064 bytes
SHA-256: 803b832bca5e795d4dcad759150aedbb16eeabce0986496fdf05267b5d9ad20e