Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f1aa274d815191…

MALICIOUS

PDF

99.0 KB Created: 2021-03-30 07:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4db9654f8609d7c6c2f716b2f9c5dfe7 SHA-1: 8be9dba696519dc3c8ba520445eca125a052b09b SHA-256: 30f1aa274d8151915d3e3cf99a788bfc7c196e5bf1023ee8ef394f085c108c53
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=anti+deep+freeze+v+0.4+free+download PDF link annotation
    • http://hellochildren.online/how_to_set_timer_on_delonghi_dragon_3wcfp8.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/agile_project_management_free_download.pdfIn PDF document text
    • http://cabinetshq.xyz/nsfas_bursary_formyoxwm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_6023fbd33a541.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/knee_joint_exercises.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/enalapril_davis_plus.pdfIn PDF document text
    • http://vehicleinsusa.com/zezawebirmymnc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5fcc429d5687a.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/cdta_12_bus_schedule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_b761187ca2914494b47da037c8f78fd9.pdf?index=trueIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_845e4ce4f07944dabdefda0def31fabd.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_b6093d5ba18d4200a824e0ee781a5151.pdf?index=trueIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_712b7265921f493ebc216cbcb139c350.pdf?index=trueIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_bddfce4f1917446e826aabeb27d72437.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/020c6d2f-f6bd-47c9-b597-367ab4600c6e/books_like_michael_crichton_timeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8968f969-0d3a-42bb-83fc-abc32873bd01/seranotejejedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d19f56-f29d-4854-9819-7ddbf68d6151/sabomobaxabuzonopiwi.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_5265b53d94d84e38b83666063b42983f.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_361027c3fdc043288684a1f7645e74d9.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 5100 bytes
SHA-256: 8bab9d21a418e537bd8f6b5c9960980f759efaf29e1a9c843ac7dcff9b991cd2
font_01_sfnt_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 3796 bytes
SHA-256: 96fba23c6b9692894415043d693e2ff1aa7a11c3a6ebb4435114f1017ccdede2
font_02_sfnt_off000148fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FB 11376 bytes
SHA-256: fd5e842a526560161ced58567f765843d8424d4ea0d7c37310ff97863de9f930
font_03_sfnt_off00016fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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