Malicious PDF — malware analysis report

Static analysis result for SHA-256 613ad378e53bb506…

MALICIOUS

PDF

39.5 KB Created: 2020-05-15 09:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18182461162a05feffa1872aa48437d3 SHA-1: 86145c4d98d355a835ac76ff7e7c4ee053117add SHA-256: 613ad378e53bb50661bdcd47a905febeb86380f32e9a6b2a440d90c3a4f49a98
136 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are structured as numeric slugs and point to other PDF files, suggesting a link farm for SEO manipulation or malware distribution. The document body text, though heavily obfuscated, contains references to 'Yahoo aviate launcher apkpure' and URLs that are also present in the heuristics, indicating a lure to external content. The presence of 'cmd.com' in the document text, alongside external URLs, suggests an attempt to execute commands or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://digitaldocmd.com/uploads/1/3/0/5/130551704/130551704.html#yahoo+aviate+launcher+apkpure
    • http://claude-torriani.com/uploads/1/3/0/7/130775355/romuxate.pdf
    • http://ideasparacambiarsanluis.com/uploads/1/3/1/4/131438197/zepawozoboso_fuvakumaxene.pdf
    • http://primordialsoap.com/uploads/1/3/0/4/130489800/c1911941ba.pdf
    • http://theonlychildnetwork.com/uploads/1/3/0/3/130323675/gufixom-mobonij-loregidapu-wavix.pdf
    • http://keriaskloset.com/uploads/1/3/1/1/131164524/3789473.pdf
    • http://joesprosit.com/uploads/1/3/1/4/131407089/wamopokel.pdf
    • http://ogihara.fi/uploads/1/3/1/3/131379894/wepumoj.pdf
    • http://libertyalabama.com/uploads/1/3/0/8/130874272/2336539.pdf
    • http://doneagainhomes.info/uploads/1/3/0/6/130621789/karusuwilisafote.pdf
    • http://wellatarian.com/uploads/1/3/0/6/130605490/gonerene.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058a5.bin
74f802afb0f9645801770bcf5ae656c0c269f8410b0ff0976a33677dbbace971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A5 10872 bytes
font_01_sfnt_off00007dde.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDE 16092 bytes

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