Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0a50c516ea1f81…

MALICIOUS

PDF

86.4 KB Created: 2021-06-10 19:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43c8c6c28e63d308cab08ea8a4119b6e SHA-1: c65388f80f78deb9f99c3cd50f1b916a6c175d83 SHA-256: db0a50c516ea1f81c0d324b0f4c0e03150e54b7c783900082e7ad878daa115dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many hosted on disposable platforms like Weebly, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://archism.ru/pbw?utm_term=shiv+stotram+by+varsha+dwivedi
    • https://zusiwugebibod.weebly.com/uploads/1/3/4/4/134484471/3805e7f59a871c.pdf
    • https://fobepomakiroka.weebly.com/uploads/1/3/0/8/130874330/d7de43a002117d.pdf
    • https://lopewibuwo.weebly.com/uploads/1/3/4/9/134903232/gobarenebuz.pdf
    • https://mijipunipiju.weebly.com/uploads/1/3/1/4/131455283/1971687.pdf
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/1d34a5efdb.pdf
    • https://werafapotavide.weebly.com/uploads/1/3/0/9/130969473/5333661.pdf
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/vasuwa-vakewikom-suvuwoleki-fulet.pdf
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/xulasofavezovukajabi.pdf
    • https://cdn-cms.f-static.net/uploads/4476782/normal_602b0b7659d76.pdf
    • https://cdn-cms.f-static.net/uploads/4422890/normal_60677ba446c0d.pdf
    • https://suxosuliresud.weebly.com/uploads/1/3/5/3/135351283/eefc2e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/4a1274e5-29b5-49c0-8d53-7d1f56b8b2e6/zimilukuwatikiraji.pdf
    • http://pesivop.pbworks.com/w/file/fetch/144875613/dudalob.pdf
    • https://uploads.strikinglycdn.com/files/d2b0663a-1766-482c-bd53-541573c28c56/24125668427.pdf
    • http://tukufidanega.pbworks.com/w/file/fetch/144616113/mla_format_8th_edition_citation_generator.pdf
    • http://lakebimutep.pbworks.com/w/file/fetch/144743994/fitzpatricks_color_atlas_and_synopsis_of_clinical_dermatology_8th_edition_download.pdf
    • http://duziruromeja.pbworks.com/w/file/fetch/144793092/dekedagowafemaga.pdf
    • http://jetipufagi.pbworks.com/f/fiviwimelepejog.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab5.bin
df9979a23d8287519169eb9be5983cd4df54c780f862f691e2b1e77574b108f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 5532 bytes
font_01_sfnt_off0000ed6d.bin
401211c5390164636a279c69fbdae326d178d78f5a0fa6d6f42fa8ad94f9378d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 11044 bytes
font_02_sfnt_off000111dd.bin
9e8409b995ac2b0bb76eb3eb8dd1c90fa55d1c1c8a40bb5daa08ca4080948d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 18776 bytes
font_03_sfnt_off00012f80.bin
bc242e8dcd06ef51b5f6030f5a9c84e21e0bdf80d527b525caaebc3d7621a566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 7840 bytes

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