Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd56a1197b9986c…

MALICIOUS

PDF

45.0 KB Created: 2020-03-08 04:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1bcad02e415112eb020867a3606587f7 SHA-1: 3e69eba8f57d9907cd4ccfd3a5d2315f952769ae SHA-256: dfd56a1197b9986cf2e4f9a2975ba21b13536552b5dcb1e2a66a76f0de166c35
94 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, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external URLs points to a delivery mechanism for potentially malicious content or a phishing attempt.

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://merrit-wedding.rominastiebenphotography.com/uploads/1/3/0/4/130478772/130478772.html#cumulative+distribution+function+excel+example
    • http://stepup.london/uploads/1/3/0/6/130620948/421ec895a49.pdf
    • http://myvisl.us/uploads/1/3/0/3/130313289/6347446.pdf
    • http://www.leeslawnmowerandsmallenginerepair.com/uploads/1/3/0/3/130323271/jofitidozaki-pagopodakatitin.pdf
    • http://empoweredptbirth.com/uploads/1/3/0/7/130738628/gejolurigufoj.pdf
    • http://balboaislandrealtor.com/uploads/1/3/0/5/130550711/276e3d018a2.pdf
    • http://scribblesandwhispers.com/uploads/1/3/0/4/130489398/2751401.pdf
    • http://nationaldebtmgmt.com/uploads/1/3/0/7/130739653/d0f788aa68de3a.pdf
    • http://raahulramakrishnan.com/uploads/1/3/0/2/130271002/1d9fc26.pdf
    • http://northsidecigars.com/uploads/1/3/0/7/130775134/xigowawovula.pdf
    • http://juliewilkening.com/uploads/1/3/0/6/130604710/bipuxemewiko-visogono-tatisifomisow-koxiligok.pdf
    • http://allopoisson.com/uploads/1/3/0/4/130483581/c032199.pdf
    • http://hostmaster.umbrianhills.vc/uploads/1/3/0/8/130874488/mowadif.pdf
    • http://hostmaster.theolivercurdtrust.org/uploads/1/3/0/8/130873860/3e5bd30b41.pdf
    • http://cotoart.com/uploads/1/3/0/4/130435937/9a01cb.pdf
    • http://nationalfootballcheerleadersalumni.org/uploads/1/3/0/4/130479044/801f3d6.pdf
    • http://1stollie.com/uploads/1/3/0/6/130605493/9231661.pdf
    • http://www.minimalteacher.com/uploads/1/3/0/6/130639356/66503b921fe.pdf
    • http://jessiessouthsideperformance.com/uploads/1/3/0/6/130621032/9bb00.pdf
    • http://makearteveryday.net/uploads/1/3/0/6/130639175/xekakuvosawa-rupewutoje.pdf
    • http://rachellepinnow.com/uploads/1/3/0/2/130271131/3249462.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e0.bin
307f2db4753c4a6dfec9e809ee63b8751134b1f33f256a917eb38012ce8ee233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E0 8016 bytes
font_01_sfnt_off000085e4.bin
39bc079289fa647ff8c8bc8a836ada9dce32d68f37464a9c317e1578ffe60a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E4 2820 bytes
font_02_sfnt_off00008fe7.bin
c715d70b655cc84612960fb88a4e12085ad92abfa9c7e55edaa865827c7872ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE7 16148 bytes

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