Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4113aa763dedf5…

MALICIOUS

PDF

45.9 KB Created: 2020-06-03 04:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db6854c607e91d4b7971bb8b5bd37969 SHA-1: 61cc114431caa8ee4153bdf239964592f00e2418 SHA-256: 8b4113aa763dedf5cf57ce5db41f64975d83074e09601ccab3ad5916f517a31b
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body suggests it is a lure for "Parliamo italiano 5th edition answers", likely intended to trick users into visiting malicious or phishing websites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm or phishing attack.

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://journeywithtornia.info/uploads/1/3/0/6/130621666/130621666.html#parliamo+italiano+5th+edition+answers
    • http://larcabalandsanchezoptometry.com/uploads/1/3/1/4/131407440/xileji.pdf
    • http://dropoak.com/uploads/1/3/0/4/130483842/kogomikefu_jimunejar.pdf
    • http://hostmaster.westmalvernwi.org.uk/uploads/1/3/0/4/130476778/golizerumu.pdf
    • http://slimsolutions.ca/uploads/1/3/0/5/130539934/lelem.pdf
    • http://nashyhealthcareltd.co.uk/uploads/1/3/1/4/131408245/ad1f1840b2093.pdf
    • http://massagewestborough.com/uploads/1/3/0/2/130288580/0533694b3.pdf
    • http://weeg2019.com/uploads/1/3/0/5/130540284/kutiperepusikin_sagameb_gemovu.pdf
    • http://pope-motorsports.com/uploads/1/3/1/4/131407592/xugekebajoluwam.pdf
    • http://mochagirlbasement.com/uploads/1/3/0/5/130588405/1223019.pdf
    • http://journeywithtornia.info/uploads/1/3/0/6/130621666/terms.html
    • http://journeywithtornia.info/uploads/1/3/0/6/130621666/dmca.html
    • http://journeywithtornia.info/uploads/1/3/0/6/130621666/policy.html
    • https://butisukumig.files.wordpress.com/2020/05/tomufofeligikiwemuz.pdf
    • https://pukivez.files.wordpress.com/2020/06/91084875975.pdf
    • https://bemurates.files.wordpress.com/2020/05/porababuzimifovojiputodel.pdf
    • https://semilizuburu.files.wordpress.com/2020/05/sobenapalunelonuguzidaje.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_off0000704e.bin
aa1a0169a0ec5a9a6294ea541e8f47233778a67eb960c23b8236f72cb34fad6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x704E 11328 bytes
font_01_sfnt_off00009474.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
pdf-font-stream PDF embedded font (sfnt) at offset 0x9474 16204 bytes