Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab9776f551d84b8…

MALICIOUS

PDF

47.7 KB Created: 2020-03-29 05:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07eeb86889f7c7004446458f5c1a6a54 SHA-1: 7cdb322386299e9015457de5114b1eca9df525f2 SHA-256: 1ab9776f551d84b8e9a55e35dfad806172c8c884e98e2c297cdd32a11f1d55ef
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier. It contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains the title 'Uso del hidroxido de sodio en la vida cotidiana' and references the wkhtmltopdf tool, suggesting a potential lure document. The primary attack pattern appears to be a link farm designed to redirect users to potentially malicious content hosted on numerous external sites.

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://valssalon.com/uploads/1/3/0/7/130738798/130738798.html#uso+del+hidroxido+de+sodio+en+la+vida+cotidiana
    • http://sanitarypumpsandpart.com/uploads/1/3/0/8/130873943/womanefuzasodujuvo.pdf
    • http://mycashflowmentor.com/uploads/1/3/0/5/130589279/bezitisorunas_zelabapip.pdf
    • http://asassaude.org/uploads/1/3/0/7/130739308/zulugu-sijejemom.pdf
    • http://thepoonpontoon.com/uploads/1/3/0/2/130291415/6aa4ce44346225f.pdf
    • http://doubledeckvan.com/uploads/1/3/0/6/130621211/7863048.pdf
    • http://trishasxtremeclean.net/uploads/1/3/0/6/130621071/058b58.pdf
    • http://nortegrandeenelmundo.com/uploads/1/3/0/7/130776724/movipaseronepuzixana.pdf
    • http://southof23.com.au/uploads/1/3/0/6/130604378/2457590.pdf
    • http://esavvie.com/uploads/1/3/0/6/130604962/varolomug_sapakulobozos.pdf
    • http://orlandoforeclosurelaw.net/uploads/1/3/0/5/130550848/1562002.pdf
    • http://yourself-storage-units.com/uploads/1/3/0/2/130292073/delev-tapezerun-monupudo.pdf
    • http://credit-default-swap-attorneys.com/uploads/1/3/0/7/130776381/rabirete.pdf
    • http://mergny.be/uploads/1/3/0/3/130379210/remafa-mawirosarola.pdf
    • http://adirondawg.com/uploads/1/3/0/2/130289696/godalusikiwedaj.pdf
    • http://coastalzephyr.com/uploads/1/3/1/3/131382118/popojigeroxapuzaw.pdf
    • http://imanihandcrafted.com/uploads/1/3/0/4/130478438/6097637.pdf
    • http://www.nucleovanazzi.com/uploads/1/3/0/5/130545199/taditetukagoj.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_off00008ce8.bin
88a6581d9a0e4808130d2ad669ef5d05effd098902a369146024fa57cdecbd35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE8 9728 bytes

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