Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5c4f5f8f973df6…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 21:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6872ec4cce752d86c0cce7a800b7746 SHA-1: eb283ba6f605cd2a4713d06f6b62588af00b0fab SHA-256: 9f5c4f5f8f973df6daf2994ee31c753c2f7bf0ebc97c59ce6d92a24abd3d6a2f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The primary malicious URL is https://golowaki.ru/award?keyword=actuary+exam+fm+study+guide+pdf. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to spearphishing.

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://golowaki.ru/award?keyword=actuary+exam+fm+study+guide+pdf
    • https://cdn-cms.f-static.net/uploads/4450353/normal_604e5a2504c8c.pdf
    • https://cdn-cms.f-static.net/uploads/4467560/normal_605d6d8d6cadf.pdf
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5ff882759db2c.pdf
    • http://tokepubex.getenjoyment.net/29618175695.pdf
    • https://kebokezuzak.weebly.com/uploads/1/3/5/3/135318209/desibapifafog_luwifefozifemo_nukaxubidonad_tufobitoj.pdf
    • https://cdn.sqhk.co/jovojatubo/dohgRij/81613985178.pdf
    • https://cdn.sqhk.co/baxoladipezu/hebjhRx/pizozegufulodavofo.pdf
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/goderinoxiwet.pdf
    • https://kuximakid.weebly.com/uploads/1/3/0/7/130739256/mizolajozomiwe.pdf
    • https://cdn-cms.f-static.net/uploads/4506159/normal_5fe66a98f0d13.pdf
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fd3b2258a9d9.pdf
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5fe714213d331.pdf
    • https://cdn-cms.f-static.net/uploads/4485698/normal_601d26172255c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_db87f469d2474fb88cf46a2ff593d8c3.pdf?index=true
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_47e5e9bc793b416da07e4847f7d9b6ed.pdf?index=true
    • http://bumurulepowele.myartsonline.com/common_pronunciation_mistakes_in_english_for_chinese_speakers.pdf
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_7d6db646d99b40b68b4426f3e75fc703.pdf?index=true
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_df9d15ec2583416dbea968fcc1248add.pdf?index=true
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_2ba7f4ea2b7a472eaac858c9a9af6cac.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_off0000ecf4.bin
dadad179c2f6a537ece91d795cd8d4899bf76c3637308ce566fcfbbe3b41b5e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 5600 bytes
font_01_sfnt_off0001000c.bin
ec2a7e1ca7481101843d86e81a5269cf52c69d2c116bf21ca0e6341e94f4dd7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 9924 bytes

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