Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb1e2d2d4113a8d…

MALICIOUS

PDF

70.5 KB Created: 2021-06-14 03:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 14355a1e9fb3afd0117630b8af146b21 SHA-1: b106667f95723e76dc873ac3ecc62b194a9e1eaa SHA-256: dfb1e2d2d4113a8d3da6a907a49de68f378e7a4c34a69237a78f977205415cbf
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, indicating it functions as a link farm, likely to direct users to malicious sites or for SEO manipulation. The presence of embedded URLs and the nature of the link farm suggest an attempt to lead users to potentially harmful content.

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://chcial.ru/pbw?utm_term=kkh+mod+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420610/normal_606de28ecd9e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_6020672768e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_6041930932ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_603f0cbfd28ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_606599b45517f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_601306232ec77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_60c684fe6766a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_6038949e46704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_603ffa3b3884c.pdfIn PDF document text
    • https://dosarowit.weebly.com/uploads/1/3/4/3/134315771/sutaverovofo.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/4cb373.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/siramopiniroxov_kenofose_nalapomowejol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_605282897ff41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fawugomem.pbworks.com/f/conan_exiles_elephant_location_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bcabb8-0f9e-478c-871f-028121a7f40c/34209023006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9591db8c-5e2c-427e-af5d-36fcb47b8ca1/zoom_h1n_oder_tascam_dr-05.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06eb027-6b6d-4261-bcaa-92d8a5f542e2/86930760441.pdfIn PDF document text
    • http://pebakix.pbworks.com/w/file/fetch/144756024/dollar_tree_near_me_hiring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bde57f-0385-4d9d-839f-6ba1c927793a/taken_2_full_movie_in_hindi_download_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577f822d-2f83-4596-b2c2-49d14a748ca4/65885403276.pdfIn PDF document text
    • http://fudotedafeji.pbworks.com/f/cell_cycle_mitosis_and_meiosis_test_review_answer_key.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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 4760 bytes
SHA-256: a41b4ff98f93cca4efe2725166fe42abe4da9f4782967198053febdbedf0f069
font_01_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 10380 bytes
SHA-256: 59a686ab5578371b3bd6b49fd2c670a0af83eef046336e288604e7e2bcb764af