Malicious PDF — malware analysis report

Static analysis result for SHA-256 40595fa0e67aade6…

MALICIOUS

PDF

89.9 KB Created: 2021-03-14 00:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 847a9d5baa48f25f53c153e0672aa271 SHA-1: 1375eb1c65bf81ea72127eee853913f6f78e6b3b SHA-256: 40595fa0e67aade6f32c36de2a42d6456d88eaffa1ca9c781b35b6d4f1636b05
156 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 0.9993

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 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.
  • 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://fokemale.ru/award?keyword=an+occurrence+at+owl+creek+bridge+ambrose+bierce+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460060/normal_5fd60ccfd6702.pdfIn PDF document text
    • http://fishland.store/fesasujikakqw538.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/2771520.pdfIn PDF document text
    • http://erogan24.website/salesforce_marketing_cloud_ampscript_guidetcieb.pdfIn PDF document text
    • http://instacopyrightcenter.com/bebedukulopwok9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_601f3dc97fde7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_60176dd88d943.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/jefilurovok-nuxirosove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_60318f803a905.pdfIn PDF document text
    • http://fruct.space/what_are_the_features_of_arduinop70qx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5fc7db79ecc22.pdfIn PDF document text
    • http://andyhongdigital.com/zisurikaguphxvts.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/37181186-b6b6-4c43-b32a-57680a9fc627/95391030143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468ebe24-9b00-4790-88f1-c41d02647b8b/63489478506.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/76851142896.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/bonavita_coffee_maker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/best_korean_mask_sheet_for_oily_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e24d94-cb0d-4c3a-bf2b-dd01853d72f9/is_dunkin_donuts_stock_a_good_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/vutuxanukufetar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fcb5149-ee6e-44ca-93b9-f5e6732e2f36/xiravisuzogakapa.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/hoover_twin_tank_steam_mop_wh20200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a98e0f-2182-48e7-91b3-8ca0aabf3131/59965430526.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/what_is_the_best_keto_diet_plan_for_beginners.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_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 5760 bytes
SHA-256: bc7e981c619daea3571e4c453291efc94a28961e5c94be7ed5a82540727a0419
font_01_sfnt_off00013551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13551 10612 bytes
SHA-256: 8b9d53dc12e00be53bce2d29a7e37127c9055c64c6540c1f1a4b76986d5eddb0

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