Malicious PDF — malware analysis report

Static analysis result for SHA-256 a655553fee9ed15a…

MALICIOUS

PDF

46.6 KB Created: 2020-04-02 16:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ddd8d4b6b6431d4af2dbecf4eda6fa8 SHA-1: 338b4c148b02a6019f28f1d56821b7a3d9e841e9 SHA-256: a655553fee9ed15a2c8220d01116072f2359b120f5f82559af45be2871a1e916
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to URLs that are likely part of a link farm or a redirection scheme to host malicious 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://probateinutah.org/uploads/1/3/0/8/130814408/130814408.html#mesleki+geli%C5%9Fim+kuramlar%C4%B1+kpss
    • http://gopharmaglobal.com/uploads/1/3/0/9/130969522/suweruxidubit.pdf
    • http://taylorlench.com/uploads/1/3/0/2/130272977/mogideridafi.pdf
    • http://obrienventures.com/uploads/1/3/0/6/130605119/mazobaxuvuv.pdf
    • http://consignmentyourway.com/uploads/1/3/0/5/130588951/pamegibomum.pdf
    • http://mrserickagraham.org/uploads/1/3/0/7/130738912/8525519.pdf
    • http://sianlane.com/uploads/1/3/1/4/131438709/lijodilug.pdf
    • http://tuckerconstructiongroup.com/uploads/1/3/0/2/130289733/0ad4af65bed2368.pdf
    • http://inkyagnes.com/uploads/1/3/0/5/130588565/fuwaguwe.pdf
    • http://colocatio.us/uploads/1/3/1/4/131406263/jifobune.pdf
    • http://tennieconstruction.com/uploads/1/3/0/8/130814193/tekutamonos.pdf
    • http://sandersoninsurancegroup.com/uploads/1/3/0/6/130639032/mejozubi.pdf
    • http://blindtigerbarberco.com/uploads/1/3/0/6/130620555/tonizej-jefimukuzulo-fateni.pdf
    • http://youringenuitees.com/uploads/1/3/1/3/131398334/1447255.pdf
    • http://sweeteaglebakery.com/uploads/1/3/0/9/130969542/gomopis.pdf
    • http://riverviewoutdoorvball.com/uploads/1/3/0/7/130776720/pasevo-larogezipofuna-jiralaxip-guxumet.pdf
    • http://svirrigation.com/uploads/1/3/0/3/130323249/1011002.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_off00008be9.bin
4941499135c06836d4144ada7e73fb07f36439a1d3874fc005b5d33f309792c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE9 8772 bytes

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