Malicious PDF — malware analysis report

Static analysis result for SHA-256 7780a03e8a2037b5…

MALICIOUS

PDF

32.8 KB Created: 2020-04-04 06:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 219ddd60f39f26be97c626f41a030d21 SHA-1: 9396c4f7f785abe007e900b303a38c679cfa2005 SHA-256: 7780a03e8a2037b5dc7e3bdb89119051ad46bed2e030488299040c1a8cd9c036
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, directing users to various domains. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

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://theclassyandjazzyboutique.com/uploads/1/3/0/8/130813601/130813601.html#dimensiones+antropom%C3%A9tricas+poblaci%C3%B3n+latinoamericana
    • http://prcstlouis.net/uploads/1/3/0/4/130476024/7698219.pdf
    • http://sacredcirclecounseling.com/uploads/1/3/0/4/130436079/8648811.pdf
    • http://mindregard.net/uploads/1/3/0/6/130621614/mitikitofiwif_lafevezipuxopu_juxeluso_xutiw.pdf
    • http://allstarlawncarerva.com/uploads/1/3/0/2/130271153/8590940.pdf
    • http://sellingasascience.com/uploads/1/3/0/6/130605482/fagiv.pdf
    • http://frederickmartialarts.com/uploads/1/3/0/4/130483781/6559d60c7d.pdf
    • http://avediflooring.com/uploads/1/3/0/5/130543264/xatuposisixamuvolut.pdf
    • http://gardeningthesoul.com/uploads/1/3/0/5/130550940/ragemafedowok-gawub.pdf
    • http://healthybeautifullegs.com/uploads/1/3/0/7/130775342/219f2.pdf
    • http://ccmun.ca/uploads/1/3/1/1/131163666/e8841.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_off0000561c.bin
dba61e69df3ff16c72dbfe291b8f567955927e388cdb245ccfb287ad6fd45cd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561C 8004 bytes

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