Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f4e44a9cdb4346…

MALICIOUS

PDF

76.6 KB Created: 2021-01-07 10:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 66b3eebd28021da32db40fec9084473b SHA-1: 9a2735c92615bb130c74428cb7454d4270c48ff3 SHA-256: 18f4e44a9cdb4346973155aacd367b8f79eedeb2d8469e8de242a7ddd1d385e0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating a phishing or malware distribution attempt. The presence of a large number of external links, as noted by 'PDF_SEO_LINK_FARM', further supports the malicious intent of directing users to potentially harmful 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=uc+irvine+demographics+asian In PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/32d65a10012579.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/4cdkcvG/merge_dragon_event_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_5fbebd0b32545.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/dbd7dfa4d11.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisurav/mIjiOQI/ivan_pavlov_experiment_results.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5fef5e6ab610f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fc04f7d2e8c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/edbba2a6-14a8-4fc4-bb9d-085b57b4d7dd/zudiwusixusite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896eda07-57c3-4b01-a272-41d297472fb6/prepositions_of_place_worksheet_intermediate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca041494-3fde-4453-985b-219bdaaa2382/vidowiwebow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8539ed1b-a17c-45f3-be3c-829c6c9954c5/dolexuvub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea238c7-0191-4c40-ae07-919c42ab9575/introduction_to_hydrology_viessman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2152fb46-ceab-4e3a-99a4-1419a3851567/fesagubiporebofejanapox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 5212 bytes
SHA-256: 8f70f9b6a85702bbb67ebba30b0ccfd71afe5723c6d06b657416af034ffedae2
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 10756 bytes
SHA-256: 88d58a25ff73a010a5f1882d7a31c6ced53fdcf2347c48d9c28ee808cfd8eba3
font_02_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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