Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1c5d52fd5b548a…

MALICIOUS

PDF

76.7 KB Created: 2021-03-28 10:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b100f2fef1495db032706a4cd42d9def SHA-1: 2c3cd8163e50a204f52434ebed5a2e5a2b88f045 SHA-256: 1d1c5d52fd5b548a0edd73c9c6895274abfcd1f11178189fa80add1d83d22839
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being lozipotod.ru. This suggests the document's purpose is to redirect users to potentially malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lozipotod.ru/123?utm_term=class+dimensions+guide+pdf
    • https://cdn-cms.f-static.net/uploads/4459059/normal_6039d73b8415e.pdf
    • https://cdn-cms.f-static.net/uploads/4496607/normal_60602393bd14f.pdf
    • https://cdn-cms.f-static.net/uploads/4406229/normal_60556ac67a66e.pdf
    • http://pewujok.mypressonline.com/how_i_became_a_pirate_musical_script.pdf
    • https://cdn-cms.f-static.net/uploads/4367905/normal_605bc9e14142c.pdf
    • http://zuzavepojul.mygamesonline.org/ancient_greek_art_and_architecture.pdf
    • https://cdn-cms.f-static.net/uploads/4391015/normal_6033287d2cbc3.pdf
    • http://pogibofabut.getenjoyment.net/lesenubokerezilijawepite.pdf
    • https://static.s123-cdn-static.com/uploads/4482020/normal_5fca8a698f35a.pdf
    • https://static.s123-cdn-static.com/uploads/4454280/normal_5ff58aa596de2.pdf
    • https://static.s123-cdn-static.com/uploads/4403117/normal_5ffb6a8bcad92.pdf
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fe9620124475.pdf
    • https://static.s123-cdn-static.com/uploads/4481671/normal_5ff5112ee1ca5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e1ce8a3f-01b1-4f54-82b8-7cf623629c33/how_to_connect_my_hp_deskjet_printer_to_wifi.pdf
    • https://uploads.strikinglycdn.com/files/92fc9e05-833b-4b55-b5c3-f293c369736e/porizonaf.pdf
    • http://zakefuki.myartsonline.com/basaniwoxu.pdf
    • https://uploads.strikinglycdn.com/files/da8a48a6-2fae-446d-bd1f-f42f74cd08fb/13602898786.pdf
    • http://megigezorozo.atwebpages.com/livros_brasileiros_para_jovens.pdf
    • https://uploads.strikinglycdn.com/files/facb6059-8155-4baa-af3b-d8ea884ad07e/20539362342.pdf
    • https://uploads.strikinglycdn.com/files/a62b2e38-5b44-42bb-8806-a7ca6228cc3c/a_thousand_splendid_suns_summary_chapter_44.pdf
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_a0d3b26a03544efb821f61f542aa9253.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5f11b9b9-55eb-4561-b130-df5d9ba0342a/how_much_caffeine_is_in_monster_vs_red_bull.pdf
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_8ef1fbd0ee6c4c789cc2e1fa77c5b914.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cede612d-3bc6-4bc5-8363-8f0d57445b9d/wodap.pdf
    • https://uploads.strikinglycdn.com/files/a4c12a38-e9de-42f3-8394-60f3a2d2b9bd/bobivubedela.pdf
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_94a934e7897a40e687a6bf18d9b88e1b.pdf?index=true
    • 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_off0000eecb.bin
c80f846695464b3e5ced9ebe54422f430bb76e446039d4655fff2315a8e070c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 5168 bytes
font_01_sfnt_off00010051.bin
5c713844f3efa9ec27e16e948110ef3fcfebe8af2ef4ebf9cec1b2d39bcc7e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 10736 bytes

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