Malicious PDF — malware analysis report

Static analysis result for SHA-256 30efa37065ed77b2…

MALICIOUS

PDF

70.0 KB Created: 2021-02-09 01:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 410f058d555d5ea6fa8de1ab43d57509 SHA-1: 7beb52a5ae257c69867aad825c2c122f7d365506 SHA-256: 30efa37065ed77b2a3104caca5b9dc53f286b9f6b0c20b674e5f3d1661c3b0fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, indicating a link farm strategy. One of the primary URLs, 'https://maypoin.ru/wb?keyword=aahat%20horror%20song', suggests a potential phishing or SEO manipulation attempt. The presence of numerous external PDF links, such as 'https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/nasufivigezutizuwik.pdf', further supports the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/wb?keyword=aahat%20horror%20song PDF link annotation
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/nasufivigezutizuwik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_6010fd76a49a9.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/e4ZZKLm/92870382208.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/bUW78ij/ricoh_color_controller_e-_22b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5fe1474d04aad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374371/normal_5fe1886593120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_601870eccd39f.pdfIn PDF document text
    • https://zelasiboromur.weebly.com/uploads/1/3/1/6/131606405/veguvamenadodetaziz.pdfIn PDF document text
    • https://vifegozotamideb.weebly.com/uploads/1/3/4/2/134236473/4856931.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/iqwhcie/lojizererudovinumilijuse.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/agcFjat/ministry_of_defence_jobs_assistant_director.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/igWhcK6/mechanical_keyboard_kit_hot_swap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453102/normal_5ff0aeff5cce8.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/hsgfhig/78410181156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5fde03ae5120b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ffe927e5a87d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 4904 bytes
SHA-256: 04f1ff5c726ac977fb03aaf7c5166afc4316365c0ef627def4ad719822d0074e
font_01_sfnt_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 10524 bytes
SHA-256: fd215bf74b727d1eb87ee383c8d6aac77e32b77b7d177a5400046c248a548229
font_02_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 2756 bytes
SHA-256: 1ca2060df2b3c3729bacf115b5bc86ed0fb3c4b22372bb4120b54a25df6b6a9b

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