Malicious PDF — malware analysis report

Static analysis result for SHA-256 edac808b88557e61…

MALICIOUS

PDF

78.4 KB Created: 2021-03-30 22:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315c72ff33fdb2d59c823b8cdf48a864 SHA-1: 02586398ae053c2328c35de185c38f7ce9699d0e SHA-256: edac808b88557e611cb9c307a10af280b0c41f50dfa082d10f8e48f5d82afee4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

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://resalured.ru/strik?utm_term=fun+math+worksheets+4th+grade+pdf
    • http://bukuminuwakub.mypressonline.com/zobavanejekolilagewazi.pdf
    • https://lukajupuxeburi.weebly.com/uploads/1/3/4/6/134630189/18ef0146.pdf
    • http://discout.online/words_that_start_with_shrluufz.pdf
    • http://dirozigumifew.scienceontheweb.net/acting_scripts.pdf
    • http://kersita.space/77684771326je39g.pdf
    • http://bixaxivajujojar.mypressonline.com/xujomogus.pdf
    • http://tonevagewalilu.medianewsonline.com/miwubu.pdf
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/41e2ef099a7.pdf
    • http://megopoveguvujal.medianewsonline.com/lukimutelixatibuzabalik.pdf
    • https://neberesoz.weebly.com/uploads/1/3/4/5/134512227/5dddfb6055b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/47956c5f-0ee3-442f-9519-8d6b92f14771/ap_physics_textbook_giancoli.pdf
    • https://uploads.strikinglycdn.com/files/ccc47107-4019-464d-8b8a-360ec1405267/hadith_for_kids.pdf
    • https://uploads.strikinglycdn.com/files/0dcb753f-c531-4aea-b965-a4a9c545d1b2/bonifeverire.pdf
    • https://uploads.strikinglycdn.com/files/8d1bc3c6-b6c7-4198-9f3f-5de314375f3b/gemavorimumixixabo.pdf
    • http://ludugatitabi.atwebpages.com/tikoxasudofebiwuxusukudik.pdf
    • http://badamowafe.onlinewebshop.net/84665912365.pdf
    • https://uploads.strikinglycdn.com/files/52a975c6-2e8d-464d-87c9-7a4239811b8a/motorola_xtl5000_power_cable.pdf
    • https://uploads.strikinglycdn.com/files/404eb466-ec2a-4e61-bc01-a08c4ba93280/evenflo_stroller_walmart.pdf
    • https://uploads.strikinglycdn.com/files/af692695-e1a8-4d5b-b5a3-f2ff226cbce8/snark_guitar_tuner_battery_size.pdf
    • https://uploads.strikinglycdn.com/files/bec9cd18-a8a1-471a-9b2e-0245742d9f3e/2003_kawasaki_mojave_250_top_speed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e763.bin
992e812c0d6a033ad99718e2314f3e05c62c3498e34a85d052980f73d13aaec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 5456 bytes
font_01_sfnt_off0000f9da.bin
b3d5c58affd5b93563c0c31116fa07baf8acab67b157132e672b7232e079a0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10548 bytes
font_02_sfnt_off00011de9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 4324 bytes

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