Malicious PDF — malware analysis report

Static analysis result for SHA-256 757b5278603327d0…

MALICIOUS

PDF

78.1 KB Created: 2021-04-17 20:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e5aa331ed1a011f0b8574e33297d38d0 SHA-1: 2931d03f6487f4365d224e8dbecda6796d2538f2 SHA-256: 757b5278603327d0f52ff0a1e214d8bc633daff752dc6970170e34cd8450791f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://fokemale.ru/strik?utm_term=english+vocabulary+list+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=english+vocabulary+list+pdf PDF link annotation
    • http://lupapezatuna.22web.org/tecnologia_medica_en_mexico.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_b4fb043d7d1845968ed88c80dfb47050.pdf?index=trueIn PDF document text
    • http://zudujijikaj.rf.gd/pelijesibutoxuvadagepovi.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_8b788b26fc2542d88f1a24b54a833732.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_f51eca1c62ef4ee7a2b9157c87cef383.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_cee6b1cb2ee54122adc6a7d51cc85fc1.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_2159b10f56a54f5b982a8f13af8f7d88.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_04f271b845d54e8bb99aa07573ab08b1.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_c03f27e49ea0446a8dce44c9c3095d79.pdf?index=trueIn PDF document text
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_2b9687cb90e44d83bc96473239a2ebb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1195c6a9-ca36-4dfa-8f0f-05e52e12fc90/22190010845.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_0f199e7dd1c14970910df5a316236cfe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7469981c-3d14-4b3d-b42c-316b84f5cc52/how_to_compare_two_pieces_of_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a251bd-4cb4-48d4-9dc7-2543cc5def78/how_to_write_poetry_in_an_essay.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_fa64279609b8416ea102d7f075fb6e85.pdf?index=trueIn PDF document text
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_0a11193396e44305991b97501e0fd5a9.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_e4193065bf084e679e726ac38cbb1ba0.pdf?index=trueIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_891ddbe323204e0bbf8e9210bf8c73a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd96b7c1-6565-4c15-a369-7483e21f649f/hot_briquetted_iron_manufacturers.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_571344f8ad544d8ea47a96de75c96edb.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 5676 bytes
SHA-256: 4224fce023dd6c98e545e8ccd60e399c302a5b636f4b04930340c4078b2ae378
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 10976 bytes
SHA-256: 5edc773041a501a5df8279515db13f43800b31bbc48e6954e0d23d027e466784

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