Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b36f1ef3df81893…

MALICIOUS

PDF

78.3 KB Created: 2021-03-31 20:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64a502aec3d90104857a97e629cd1834 SHA-1: d0878285519ea8439eb1fd5f9667d86557294905 SHA-256: 5b36f1ef3df81893c3393cdc1b7c738d035d0031e2c00482ba14cfcd8f03ce42
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 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The presence of an external URI pointing to 'ponafet.ru' further supports this, as does the ClamAV detection as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/123?utm_term=aatish+picture+video
    • https://static.s123-cdn-static.com/uploads/4425483/normal_6007941911781.pdf
    • https://cdn-cms.f-static.net/uploads/4493545/normal_6014d24876025.pdf
    • https://cdn-cms.f-static.net/uploads/4368750/normal_605107be28cfc.pdf
    • https://sowofofum.weebly.com/uploads/1/3/2/8/132814146/d2d7c5f245.pdf
    • https://cdn-cms.f-static.net/uploads/4387424/normal_60344bd059f66.pdf
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/nezixefut_muxawu.pdf
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5ff1bb38d5433.pdf
    • https://static.s123-cdn-static.com/uploads/4421474/normal_6004a8a5b9a5a.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/masebaze.pdf
    • https://cdn-cms.f-static.net/uploads/4495387/normal_602ce4ddb3b14.pdf
    • https://nuvapagizete.weebly.com/uploads/1/3/4/7/134748671/03f7c1a0.pdf
    • https://leketupafap.weebly.com/uploads/1/3/4/5/134527175/voxolaguzofimezefi.pdf
    • https://cdn-cms.f-static.net/uploads/4383446/normal_60296c90e03cf.pdf
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/dodidu-gubalavotes-gevoles-libewode.pdf
    • https://rozinefowo.weebly.com/uploads/1/3/4/5/134576391/mapiped_betet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://854397d5-242e-4836-9f1e-4d22a5541959.filesusr.com/ugd/88a329_5adcf700dd2c4b7a819f965a79796a13.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0aba36a4-622b-45fa-866f-e4348238c81c/lolopixuboxoduvazeriji.pdf
    • https://uploads.strikinglycdn.com/files/689abe3f-9501-4d41-ae21-ce0757fb394b/kubasolosuwefuruwoka.pdf
    • https://uploads.strikinglycdn.com/files/fa4a4a5a-37d9-41f0-adab-033eae8fe07f/37548560390.pdf
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_b573a58794ce462d889b7113f50353c4.pdf?index=true
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_4e116deb91604964b0a397d6a397ebd4.pdf?index=true
    • https://93a2b5bb-aecd-41dc-861f-07dcdefec443.filesusr.com/ugd/dee83c_aa5116c7e65445f9b0db0d098a48fba7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/51ba3fee-32f9-41a7-9319-068fde8a4060/the_bluest_eye_sparknotes_quiz.pdf
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_87b26a96b8de46449a0a6bcb2a275ec7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/641b82d0-a71b-45d7-aff0-c6701e2c507a/die_kleine_raupe_nimmersatt_geschichte.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_off0000e5c6.bin
34c1f70a859bb35634cc67ae1ab0783f58b3b42d79dc9f7b83439ba4ca9002df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 4956 bytes
font_01_sfnt_off0000f6b6.bin
53535ece4313587e95afbde7aa8f9dcca4a104c0519168f48cf7e90d0e91edb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 10836 bytes
font_02_sfnt_off00011bb2.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 4324 bytes

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