Malicious PDF — malware analysis report

Static analysis result for SHA-256 558766b3b211d90b…

MALICIOUS

PDF

43.6 KB Created: 2020-06-17 04:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 5b553a3ee82734778b1087f3dc7ce70d SHA-1: 6a26f552f44aced9011686dfdde5a9c7c02ed59b SHA-256: 558766b3b211d90b78a15e9206c4ac5ed0ccfbc39e62a0c78c7610892e27ba22
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text and some URLs, reinforcing the idea that the primary purpose is to redirect users to external content. No scripts were extracted from this sample.

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://creekheat.com/uploads/1/3/1/8/131871919/131871919.html#jane+carrera+aniversario+manual PDF link annotation
    • http://makeupbymelissajayne.com/uploads/1/3/0/4/130483368/wogox.pdfIn PDF document text
    • http://chrysalisyouththeater.org/uploads/1/3/1/3/131379612/linogujejo.pdfIn PDF document text
    • http://goldenwokstrood.com/uploads/1/3/0/6/130639605/9127600.pdfIn PDF document text
    • http://artspark.com/uploads/1/3/0/2/130287394/8a26e02ec.pdfIn PDF document text
    • http://chateauneufdupapewineclub.net/uploads/1/3/0/2/130288579/zobuwabilonebi.pdfIn PDF document text
    • http://reconciliationlab.com/uploads/1/3/0/7/130776082/18ac7.pdfIn PDF document text
    • http://immobiliere-mastronicola-olivier.com/uploads/1/3/0/6/130640006/zufuzizopel_todakal_tavaviwazulix_netijewo.pdfIn PDF document text
    • http://kalapaleadership.co.uk/uploads/1/3/1/8/131858045/jawebavakakon-zorera-wujifodu-xolutefuv.pdfIn PDF document text
    • http://suburbanescape.net/uploads/1/3/1/6/131606479/108130.pdfIn PDF document text
    • http://sellhousefastvegas.com/uploads/1/3/0/3/130313541/keliwitejinedepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6951 4796 bytes
SHA-256: a90c3bb2fe2c655d79e2c4ad173337caca13cf870e07484b6f39c629851a9a1f
font_01_sfnt_off00007978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7978 12024 bytes
SHA-256: 808dfc857bcf26b0a40de7d6c7c9b5a4d247f37bdb66642603a1fd06bdb61021