Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c3cbdbc61d4a21…

MALICIOUS

PDF

91.9 KB Created: 2021-03-20 04:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9bad3d5a9c667417fde2f2f04747e88 SHA-1: e8292aff0b6f8cda13a9e4676fba3d52a4b74254 SHA-256: 84c3cbdbc61d4a215b91e4ecd6e258cb8049052774965e6f0656c4cb15541045
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files on Weebly and other domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve as lures to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=l.c.+bird+high+school
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/fizotewokoporikiji.pdf
    • https://fojakodi.weebly.com/uploads/1/3/1/3/131379163/zavaxavib.pdf
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/5424a8f6bc48a54.pdf
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/98174.pdf
    • http://poxumanavofeboz.scienceontheweb.net/kogedigosekazolojupebot.pdf
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/1110894.pdf
    • https://cdn-cms.f-static.net/uploads/4446636/normal_60247c0b19002.pdf
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/83c8e.pdf
    • http://fajiriduxir.medianewsonline.com/tomokawizomowalub.pdf
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/d1dbd0.pdf
    • https://cdn-cms.f-static.net/uploads/4369518/normal_601d5be0b297a.pdf
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5fe1c471d4fae.pdf
    • https://nakojuxipesasam.weebly.com/uploads/1/3/0/7/130776326/ea403c59ee33.pdf
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/f4cf947.pdf
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5fcb9e11adb5b.pdf
    • https://gaburizopa.weebly.com/uploads/1/3/1/4/131438784/d63c910ec136c60.pdf
    • http://kogutojoveso.mywebcommunity.org/pascals_triangle_math_definition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9b4d756d-ef13-44b6-9ca9-e971209a852d/casio_g-shock_rangeman_gpr-b1000_review.pdf
    • https://uploads.strikinglycdn.com/files/86df610f-3d6e-4d2a-b39e-85cf60c3221e/tying_knots_using_braided_fishing_line.pdf
    • https://uploads.strikinglycdn.com/files/d22a1174-b671-4421-bc37-408360f1f485/the_care_and_keeping_of_you_1_pages.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129bb.bin
7c4ca2993d0f8bca4ed44843bf09c4ebf409f3f8ba57ebaa20b2806054361ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 5104 bytes
font_01_sfnt_off00013b16.bin
4da97ac2c482bef66a474f69ab9257d14053efa1fba1e2d93c5b24189ca03316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 11524 bytes

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