Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecc8fda89ca8b16…

MALICIOUS

PDF

74.7 KB Created: 2021-03-01 15:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 42a2f2ab441e543d567a0497cbca8c2d SHA-1: 530420fb81601dd2e2afcf3ca6d91c9a3fb77edc SHA-256: 1ecc8fda89ca8b168546c0cb77e6e33072d986ca7294f6228e4abbc67399e37b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=readings+for+sociology+8th+edition+sparknotes PDF link annotation
    • http://semengergel.ru/female_jobs_in_pak_navy_2020ghuj2.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/ggfGmhy/16771382593.pdfIn PDF document text
    • https://cdn.sqhk.co/vozedolurezu/gf5iisA/79320244986.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/92ee25e35.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/3698370449313oea.pdfIn PDF document text
    • https://cdn.sqhk.co/jifonakilux/DXIiiji/magazine_luiza_e_canaltech.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/1j8hghb/poraxevizowebiwog.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/qMibiav/23442341922.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/3546072.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/QvidjiF/62060471969.pdfIn PDF document text
    • http://itsnat.space/how_to_reset_lg_smart_drum_washertgjt6.pdfIn PDF document text
    • https://lomivemaj.weebly.com/uploads/1/3/0/7/130739076/593f62a5d98f.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/eMTiajf/art_deco_sculptures_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/holt_mcdougal_algebra_1_answers_chapter_2.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/kobewamigimapopulo.pdfIn 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_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 5784 bytes
SHA-256: 36af948f777209137d98408ac812f69ee4664d92053fabbdc3892bd5463c42f3
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 10684 bytes
SHA-256: 7e5e76f60cd01eb3dfca9d8fa53f6e89cb87ee595f174d0386da27c0c004a256

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