Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d255c671e45a7d…

MALICIOUS

PDF

74.3 KB Created: 2021-06-10 00:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5c7328bb5884fee8a38b7664a4496408 SHA-1: 3c574e0f2d670ff9e1f6b2dd176ece90eb65ec11 SHA-256: 37d255c671e45a7d357f2581bac84a6ae61bb1831808c1bdd6fa59a13836679d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=iet+eicr+form PDF link annotation
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/1387752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_604d619874c53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fcb54aa220f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_603d09b72fe31.pdfIn PDF document text
    • https://ketodoligas.weebly.com/uploads/1/3/4/3/134384615/542368b3.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/2cf13efe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatesil.pbworks.com/w/file/fetch/144993819/bangla_movie_bangali_babu_english_mem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44848102-3edb-46d2-b620-0910f1665745/wewurozad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22073a95-d038-4c77-a56e-0939b1d76adf/62758717305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2beeed4a-0246-4942-a67b-381814c4e91a/easy_recipes_for_vegetarian_lasagna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f45b84-7b2a-41ac-b29d-d8bf8e599563/dependency_theory_ap_human_geography_definition.pdfIn PDF document text
    • http://fuzugimife.pbworks.com/w/file/fetch/144993177/kelewivegugabama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1341533-841b-4478-a799-0156d33f05d3/juwamuxotavuromafepafa.pdfIn PDF document text
    • http://gufikugefisu.pbworks.com/f/hp_1000_laptop_pci_simple_communications_controller_driver_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1088c3b3-f1f4-43d8-bd3b-cff2f91cf859/nolexoredugapobe.pdfIn PDF document text
    • http://mopegup.pbworks.com/w/file/fetch/144813594/nefarotefabosidutuwune.pdfIn PDF document text
    • http://xuzokufo.pbworks.com/w/file/fetch/144985914/saw_3_full_movie_with_english_subtitles.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/f/18_wos_haulin_otobs_modu_full_trke_indir_duslerkulup.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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 4544 bytes
SHA-256: adc1dc136b7165282373e21dff0b97684e5f1d8685e7969f681bc5458ea1be8b
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 11148 bytes
SHA-256: b7da016762ee95d0b068835486a331b77b647f324182c61fdb7d9b0e4ed81bcf

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