Malicious PDF — malware analysis report

Static analysis result for SHA-256 502aef628da37181…

MALICIOUS

PDF

74.2 KB Created: 2021-05-01 22:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87cf5a193a02d54beb90db05ea6fbbad SHA-1: d20493e9f585caf5ad1473714c3246391bd02aba SHA-256: 502aef628da3718104003453698ebea0cc45dc47990625ded59d762c5b7dc09a
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 are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or phishing for credentials. No scripts were extracted, but the PDF structure itself is used to host numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=trigonometry+formulas+pdf+for+class+11
    • http://bizelapeto.iblogger.org/yaml_auto_format_vscode.pdf
    • https://cdn.sqhk.co/ragejeli/RZidjgX/nolexapudafatidubabomi.pdf
    • http://jifoxife.66ghz.com/98569732859.pdf
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/fcf0cf15445a1.pdf
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/lejewewuwe-zesesu.pdf
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/xufigumimoto_tojajanuverovi_vegodesu.pdf
    • https://tizupimarijifik.weebly.com/uploads/1/3/1/6/131606002/vokujaziko-dexerixuvemuri.pdf
    • http://vazukororupob.22web.org/96050006931.pdf
    • https://cdn.sqhk.co/valipovu/gcichbj/tuzuvubukisigago.pdf
    • https://cdn.sqhk.co/jawuraxexije/cjfjfhe/sunimabor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_b9e1faaa700d4b71a65206f0f4433ccc.pdf?index=true
    • https://s3.amazonaws.com/wiwuxot/oxygen_os_for_oneplus_one.pdf
    • https://s3.amazonaws.com/lixasifasi/joninitemenariro.pdf
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_5117943d42d542e391237029bc93c369.pdf?index=true
    • https://s3.amazonaws.com/dipafuxe/best_chess_opening_for_beginners_black.pdf
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_fecd7cad77d04faba6df8478f83aae6c.pdf?index=true
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_53a76abbeee24cea8363f8afb5b8f400.pdf?index=true
    • https://s3.amazonaws.com/dikobepibelun/aluminum_sheet_rolling_mill_manufacturers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc46.bin
780a2073613c4e30386906286fe900f955f86fbabca6b73b2f2ac561ccd81c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 5580 bytes
font_01_sfnt_off0000df3b.bin
dbe43d96230e9a599b2c74505425af7624fc56ebe5652df79dc7dd6182d43e73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 11408 bytes
font_02_sfnt_off00010602.bin
391c00064d6b23566cc807f620b27548c0de35b62262d11cd32b247dd6e1e33f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 16204 bytes

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