Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd1491265bfd2c8…

MALICIOUS

PDF

76.9 KB Created: 2021-05-20 16:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bd944b3ab99f31002782d5deeb3950d3 SHA-1: bab483db1482bdd672c5ccbc66f09153ec76d509 SHA-256: dcd1491265bfd2c8b29af586a634459023fb5b912429f9c587ab37b8ce47bd4f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous embedded links point towards an attempt to redirect the user to malicious content.

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 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://dugedepap.ru/strik?utm_term=singular+possessive+nouns+activities+3rd+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485809/normal_5fe9d8ef53151.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/6735679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403263/normal_602ce29aa63ab.pdfIn PDF document text
    • https://kanelepamub.weebly.com/uploads/1/3/4/1/134132184/voteleruleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404133/normal_604b3cd2da86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6025b4c9b9514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_60646f98bf9a3.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/9fc7f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_605d7730454f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_60627637d6f54.pdfIn PDF document text
    • https://sawuzirerepobod.weebly.com/uploads/1/3/4/0/134040369/4701007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5febf83297608.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/godakigotubeza.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/7e27454d-8a85-4436-aa63-75863f12c2d3/fipev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef581b6-3638-4f24-a338-b10c5d35f786/taripalusujobasad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a259f6-0f1f-4cff-b36d-8ea97b877cdf/convert_ipython_notebook_to_file_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44afe381-e348-4f88-9696-6fb5195e5769/a_street_cat_named_bob_true_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03086ac-165a-40e1-88f0-6d66212a0efa/maze_runner_1_2_3_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609fccd4-4aa0-4604-8aa5-4ef7bc1e856d/is_catch_me_if_you_can_movie_a_true_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f921ae4-81d0-4578-bcfe-dea2a8413a50/befatibavulo.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_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 5568 bytes
SHA-256: a2c0805fb4ed9a43d43f0c946fd0903a67520700b8c55326cf3a2c5016c0744a
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 11376 bytes
SHA-256: 5bb845ba50c6449e6f364851eb7121415a4eac1daa82885c11c63a73ef42ed36