Malicious PDF — malware analysis report

Static analysis result for SHA-256 257a3ccb44fa6010…

MALICIOUS

PDF

49.1 KB Created: 2020-04-01 13:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb838266f8613312925854878a958678 SHA-1: ff3318d52f381d67d81756d050f4b14443f919cc SHA-256: 257a3ccb44fa60101b4ea59ff2b05830090a74e59fc026bfbbcc7ec7f790d5ef
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a link farm or redirection scheme, likely intended to manipulate search engine results or distribute malicious payloads. 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://wagenselleryoga.com/uploads/1/3/0/2/130289317/130289317.html#propiedades+de+la+resta+con+numeros+enteros
    • http://newnatureinc.com/uploads/1/3/0/2/130291531/nukebopubinag.pdf
    • http://ihsan.academy/uploads/1/3/0/4/130476098/kojijowosejo-kalapib.pdf
    • http://tellascarystory.com/uploads/1/3/1/0/131070230/7bdfcf46021.pdf
    • http://smartseas.org/uploads/1/3/0/9/130969459/xinuku-gatixibazog.pdf
    • http://morenews-stm.com/uploads/1/3/0/2/130274258/pakozoxerilomapona.pdf
    • http://micaelaeagle.com/uploads/1/3/1/4/131407539/59ce6825296b6e.pdf
    • http://farmplaceredirect.org/uploads/1/3/0/6/130640236/zikupuzifojafi_vawisupi_sexumivexaf.pdf
    • http://songproduction.com/uploads/1/3/0/6/130620234/lupeja.pdf
    • http://kandeboutique.com/uploads/1/3/0/5/130589229/foxuvovejedowunagov.pdf
    • http://ecolegwern.org/uploads/1/3/0/6/130603842/maziketog_xulum_wuvowixijevuf.pdf
    • http://shesphenomenal.com/uploads/1/3/0/2/130288549/lovutud.pdf
    • http://thebeautifultrail.com/uploads/1/3/0/5/130589098/65439cd36bc.pdf
    • http://dunnford.space/uploads/1/3/0/4/130435813/5cb7ab6d6.pdf
    • http://jamesmaederphotography.com/uploads/1/3/0/7/130739945/paroberuromitisafil.pdf
    • http://sflatu.com/uploads/1/3/1/0/131070611/tetoribekebemozi.pdf
    • http://bodybenefitsbath.com/uploads/1/3/0/7/130775199/lowibarisasoxemusewi.pdf
    • http://challengingshakespeare.com/uploads/1/3/1/4/131409794/sekus-kajoz.pdf
    • http://mountainforkrentalsllc.com/uploads/1/3/0/5/130539871/rigesaxugawotopef.pdf
    • http://jogihorse.com/uploads/1/3/0/2/130272353/zavexejut.pdf
    • http://stmarysautorepairandsales.com/uploads/1/3/0/2/130289292/44d61440b51ba6.pdf
    • http://sindysthreads.com/uploads/1/3/0/5/130588294/wipusilufe-jabulik-vujomimupizub-gujif.pdf
    • http://brighthealthcomingsoon.net/uploads/1/3/0/5/130539021/pupezudane_sanonaja_vibuxixofaluka_pixuluvatuted.pdf
    • http://popllectibles.com/uploads/1/3/0/5/130543995/805a77f5f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c03.bin
c3e3455ae701eb1330de1f472de3b0720240d5f1d0ddfa2ac2912f0ff5e8af41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C03 9564 bytes
font_01_sfnt_off00009e7b.bin
dffdd4541ebc9594a3dd385e42b829333d9596a6d922f6e1ace750991ff3448a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7B 16252 bytes

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