Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33b00c168ae99bf…

MALICIOUS

PDF

76.9 KB Created: 2021-03-12 05:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b0b7457c5a7c6243f6e9ef92a5777d SHA-1: 99fc351e6a67aa93d606c0231a3355d964caf843 SHA-256: c33b00c168ae99bfb08a1d989ab46f04c66a3edaf703476d273c7c4dfb745ddc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/123?utm_term=defensive+driving+course+certificate+template
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/sebagidiku.pdf
    • http://onlinekartiadesi.com/what_is_philosophys_greatest_practical_benefityw05t.pdf
    • http://goodshopsales.xyz/m_audio_keystation_88es_without_computer9o6v6.pdf
    • http://world-wildshop.com/muzujadukipadelbd30u.pdf
    • http://naturalgood.space/vusatolafokodiwax06fo.pdf
    • http://mimivudarevi.scienceontheweb.net/91213102942.pdf
    • http://fosipuzo.mypressonline.com/what_is_the_price_of_lamborghini_gallardo_in_india.pdf
    • http://nakidki-alkantara.xyz/bejarofowunisoyu2kw.pdf
    • https://xajekedifa.weebly.com/uploads/1/3/4/4/134469171/tidoso-kuvimubikinuzef-rodatekew.pdf
    • http://lowufadit.scienceontheweb.net/94939894528.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_19241af6da3541d6ba2e6c5c61d996ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1190795-1f7c-4d37-9ce2-39377663eab3/dd-wrt_wifi_extender_same_ssid.pdf
    • https://uploads.strikinglycdn.com/files/f48a547c-f962-4ce8-a353-b92cf5b68f62/how_long_to_get_stimulus_check_once_mailed.pdf
    • https://uploads.strikinglycdn.com/files/ca328a29-06da-4cab-886c-2f95589a981b/69000621211.pdf
    • https://uploads.strikinglycdn.com/files/0ac978f9-0a76-46f5-a811-d1480a28e64d/21874064741.pdf
    • https://uploads.strikinglycdn.com/files/d6c64b8d-e98e-4e9d-b876-4b240ad05e48/bidoruwivosuzuru.pdf
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_3d1a031d39074e9e80227c5b76cab9e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e789af11-0ce9-4220-b541-86e728e51f74/who_is_the_girl_in_episode_4_of_the_mandalorian.pdf
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_bb94cc184ddd4e46898f2f650cf34c5a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eda8815d-216c-434b-a56d-1154d27a114e/54296848489.pdf
    • http://perexuwofogefo.onlinewebshop.net/kaxudewuzaxawojufexotu.pdf
    • https://uploads.strikinglycdn.com/files/dcd08859-7216-4554-9b08-cda541b6b47b/ratumupozelotarejuke.pdf
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_4a9f113ef49f4bdbb2afa508392f3980.pdf?index=true
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_42c1e8b033074e94adb5a66f952f0bb2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25973ecf-0794-488b-ba0a-0244f66efc85/18786352217.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_off0000efb6.bin
cc346125503d1232014bc1a308e476b754c64d7408d6150269454c9b12f66cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 5532 bytes
font_01_sfnt_off00010282.bin
1cb2dcd515ee1a7822d95f995158f01ade9d166a887155a71ce1f6b4bd88e166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 10284 bytes

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