Malicious PDF — malware analysis report

Static analysis result for SHA-256 893eeb6c56b640e3…

MALICIOUS

PDF

36.2 KB Created: 2020-05-18 04:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2c918c2533d654369bb73267b9e2267 SHA-1: 4bbadc9e360ba9b1034b67d74a7d663d870f0a24 SHA-256: 893eeb6c56b640e38d5afbcade8ff6c088d7046c2a824091611d298c4ac3f1fd
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were extracted, the sheer volume of suspicious external links suggests a delivery mechanism for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://jossejuice.com/uploads/1/3/0/7/130740123/130740123.html#articulos+cientificos+para+ni%25C3%25B1os+pdf
    • http://nunyabeeswax.net/uploads/1/3/0/7/130738819/xenotuvumevikoxo.pdf
    • http://loversandmadmen.org/uploads/1/3/1/4/131407310/porokemuse.pdf
    • http://epidesignlab.com/uploads/1/3/1/3/131384127/volewopulamo.pdf
    • http://kidskw.org/uploads/1/3/0/6/130639471/mebevivoweduvuzavu.pdf
    • http://lesfleursdeparissf.com/uploads/1/3/1/0/131070170/6695707.pdf
    • http://mmorpgpvp.com/uploads/1/3/0/6/130621601/3220572.pdf
    • http://seaworldsparks.com/uploads/1/3/0/7/130775897/95ac95760f34d3.pdf
    • http://jacksgrilltempleton.com/uploads/1/3/0/7/130739887/1298200.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_off00005dec.bin
c6c7b35ed54be4d2405b81cd7d58c971dc6c4fb2575c3b3f6700e7d9935d6b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEC 11812 bytes

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