Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b7409b43c093c5…

MALICIOUS

PDF

39.5 KB Created: 2020-03-30 04:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31b96b3dca86d1bc3cedeadb0d811fdf SHA-1: f5da1471b48de3cdb571e5ecf034bba80a172812 SHA-256: a5b7409b43c093c551b9878e04e13e7ddd05f2ec42bd94a15c6314c44eccb9a1
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this. The document body, though partially corrupted, suggests a legal document lure, which is a common tactic to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://seastar.websalve.com/uploads/1/3/1/3/131384121/131384121.html#demanda+de+amparo+directo+en+materia+penal+estado+de+mexico
    • http://truthhomeinspectionservices.org/uploads/1/3/1/1/131164372/6740aa0a00d.pdf
    • http://bellassouthernstylephotography.com/uploads/1/3/0/5/130545636/bodezobowe_muvuforajojawof_xekopizujedi.pdf
    • http://northbrooksda.com/uploads/1/3/0/8/130813869/dd99cd5a71dd.pdf
    • http://mllefastoche.com/uploads/1/3/0/8/130814526/nixezej-xuxatotoresidam-podox-wuzodoxujivo.pdf
    • http://tophcpa.com/uploads/1/3/0/4/130488410/4632382.pdf
    • http://spa139.com/uploads/1/3/0/4/130483279/kagabigezokelubojo.pdf
    • http://bwmin.org/uploads/1/3/0/8/130813301/gakenofi_tagularoreku.pdf
    • http://bwsinvestments.com/uploads/1/3/0/8/130813531/lexevezaver_tesorus_pijegofepo_gibuvezusake.pdf
    • http://hudsonhoneyco.com/uploads/1/3/0/5/130551013/7739462.pdf
    • http://drkimchicago.com/uploads/1/3/0/6/130604072/meladifuli.pdf
    • http://sallyandalexander.com/uploads/1/3/0/4/130491271/2507a69c17094.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007024.bin
cd8a036c405c3296d49690267473dec845a8ddc59183f9fdf43b3ee80ccbf720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7024 9164 bytes

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